cannabis concentrate smell jars

Unlocking the Secrets of Making Smell-Free Canna Oil

Through trial and error, I finally found a cannabis oil making technique that is mess-free, smell-free and stress-free using the mason jar method. This canna-oil is perfect to make a large variety of cannabis-infused vegan edibles.

Note: This post has been updated in February 2020.

Making Canna-oil with the Masson Jar Method

Living in an apartment building, I try to keep the smell down when I make tasty vegan treats with a little extra magic. So here’s how I make potent cannabis oil that can be incorporated in any treats.

The Steps in Making Cannabis Oil

There are 2 important steps to making weed oil:

1.Decarbing your cannabis

2. Infusing your oil with weed

What is decarbing?

In simple words, decarbing is the process in which we heat the marijuana bud to activate the psychoactive components in the flower. The THC-A present in your flower transforms into THC. It is scientifically named decarboxylation, but decarbing is way easier to remember and say.

Why should I decarb my weed?

Unfortunately, decarbing is also the smelly step in making edibles. You are basically baking your weed.

Think back into the last time you baked a cake. Now replace that delicious golden brown smell with that powerful weed smell in your whole apartment or even your apartment building. Hell no!

You might be tempted to skip this step but DON’T!


Heating your flower is the easiest way to decarb your cannabis. While some people like to skip the oven decarbing and decarb their cannabis at the same time as the infusion, there is no proof that the infusion will reach a high enough temperature to activate all THC-A .

This means that if you decide to not decarboxylate your cannabis beforehand, you could end up with week weed oil, and no one wants that! This is why I like to decarb my weed before infusing it with my oil so that I can get the most potent oil I can.

How to decarboxylate cannabis without the smell?

The mason jar method for decarbing cannabis is great because the cooking is done straight in a closed mason jar which I found reduces the smell by about 80 %.

But let’s be honest here, mason jars are not made to be used in an oven. While I have never had a jar crack on me, there is some precaution that you need to keep in mind.

  • Be careful while handling the hot jar so that you don’t burn yourself.
  • Never put a hot mason jar on top of a cold surface. The thermic choc caused by the difference in temperature might crack the jar.

Now let’s talk about how to close your mason jar. Most mason jars come with a 2-piece lid that is meant to seal up when canning jams and while making pickles. Obviously, we don’t want the jar to completely seal-up on us, but we also don’t want the potent cannabis smell to escape the jar.

There are 2 ways to close your mason jar in preparation for decarbing your weed in the oven.

1. The aluminum paper

This is my favorite method for closing a mason jar. First, fold a piece of aluminum paper in 2 and use that instead of the flat round piece of the lid. Second, screw on the metal ring that came with the original lid so that the aluminum paper has nowhere to go. I use the same method when I’m infusing my canna-oil in the crockpot.

2.The upside-down piece

The second method for closing up your mason jar is to flip the flat circular-shaped metal piece that comes with your lid upside-down. This will stop the jar from sealing up since the thin rubber piece is not in contact with jar.

If your jar looks like this you are doing it wrong.

It might seal up in the oven!

How to infuse canna-oil?

Infusing is the step where you take your decarbed bud and then infuse it in oil. Indirect heat is best for infusing weed oil since THA can degrade if it is heated at a too high temperature. It is also better because it is easier to keep a stable temperature throughout the infusion process. This recipe uses a Bain-Marie, or water bath, method.

Since having to supervise a stove for a long period of time is bothersome, I use my trusty crockpot to infuse my oil. It keeps a constant temperature and I can just start it up at night and close it in the morning.

Start by putting an old dishtowel in the bottom of your crockpot and then place your mason jar over it. This will stop your jar from rattling round and shattering. Fill your crockpot with water until the waterline is over the oil line in your jar.

Which oil to use?

You can use any light-tasting oil for this recipe. My favorite oil to use is grapeseed oil or any kind of vegetable oil. Coconut oil is also often used.

You don’t want to infuse olive oil or sesame oil because theses strong-tasting oil can become bitter once infused with cannabis.

Crockpot temperature

Now here is the tricky part, not all crock pots are the same. My crockpot is an old hand-me-down that barely simmers at high so this is the temperature I set it up at. ( At least it was free!)

If your crockpot is new and can boil water, set it up so that the water in your water bath is barely simmering.

Now its time to infuse. I often infuse my cannabis-infused oil for up to 6 hours, but 4 hours of infusion should do the job. Don’t forget to check on your crockpot from time to time to fill it back up with water, as needed.

If you forget it for a longer period of time, it’s not a problem. I have left my cannabis oil to infuse for 12 hours before and it was as potent as my other batches.

You can use this weed oil to make tahini chocolate-chip vegan cookies!

Tips & tricks to strain your canna-oil.

I like to use a tea strainer/infuser to separate my oil and plant matter. I simply pour the oil into the strainer into another mason jar. No need for cheesecloths or ending up with oily hands. Press the plant matter with a spoon and you can even reuse your cannabis to infuse plant-based milk afterward or incorporate it in a strong-flavored edible.

THC potency and easy portioning

You can use a THC potency calculator to estimate the amount of THC in your cannabis oil.

I recommend adjusting the quantity of cannabis in this recipe, depending on the strength of your flower, to end up with an oil that has about 20mg of THC per teaspoon.

This will make it easier for you to dose your edibles. For example, if your muffin recipe makes 12 muffins, then you only need to use 6 tsp of canna-oil for all your muffins to have an estimated potency of 10mg of THC, which is a good beginner dose. It also means that there is less potency guessing between each new batch of vegan edibles.

Canna-oil: The Mason Jar Method


  • 7 grams of cannabis
  • 1 cup of oil
  • 2 tsp granulated lecithin or 1 tsp liquid lecithin , soy or sunflower




  • Keep the canna-oil jar away from light.
  • Adjust the quantity of cannabis to your potency preferance. I like to aim for 20mg of THC per teaspoon.

Identify clearly your containers of oil

Make sure all containers have a warning that the oil inside contains cannabis and what potency it has, even if it’s an approximation. Also, keep it out and away, far from noisy friends, family members, hungry pets or children.


Don’t be shy and let me know how it went! You can even leave a comment below and share a picture on Instagram with the hashtag #loudbowlblog.


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Reader Interactions


Can I make this without the soy lecithin?

Yes you can. The soy lecithin is added to help with absorption into the body, but I sometimes forget to put it in and the oil still work.

If you are making candy you need the lecithin to bind and not melt as easily.

I usually do butter but want to try oil. After decarb, I usually add alcohol a d let sit for a bit before cooking the butter over a double broiler. Can I do the alcohol step or does the lecithin replace that?

The lecithin is said to help bioabailability. I haven’t heard about adding alcohol into the preparation or what it does but I have made this recipe with only cannabis and oil multiple time and it still works perfectly for baked goods.

Love this step by step process thank you!

Can the flower be substituted for concentrates?

I have not worked much with concentrates since only flower is available legally where I live.
I have heard that some people have successfully made edible with concentrates, but this recipe is specifically for bud. It is not appropriate for concentrates since they require a different temperature/time combo to decarboxylate.
But concentrate-based edible recipes are definitely in the Loud Bowl’s future, once I can get my hands on some. ?

i use concentrates to infuse my coconut oil. i microdose so i only make very small amounts. your going to have to adjust the measureents for larger amounts of concentrate. preheat oven to 250. when preheated set timer for 30 minutes. put concentrate on parchment paper, you can use a gram glass container or a silicone jar. i prefer parchment paper because it;s easier to scrape up after decarboxylation. heat for 30 minutes. some people put the lid on the jar or cover it with aluminum foil to keep terpenes from escaping. not much will boil off at 250 degrees however. when the 30 minutes are up turn oven off but leave door closed for another 10 minutes. take out and put in freezer for 5 minutes. i use a dab tool to scrape up the decarbed concentrate. take VERY HOT coconut oil and mix it with the concentrate to thin it, i use 200 grams of coconu oil to .2 g rams of concentrate. i use it sublingually. NEVER MICROWAVE YOUR CONCENTRATE this will evaporate all of the cannabinoids and terpenes. also stick to 250 degrees or you will burnoff the good stuff. dont worry about it bubbling like most people will tell you. also if using shatter double to oven time to 60 minutes. for some reason shatter takes longer to decarb than other concentrates

Leaving my oil out the light does what for my batches?

Light can degrade cannabinoids and THC so this is why it is better to keep your oil in a dark place or in a dark-colored container.

This sounds amazing, can I use coconut oil or what type of oil do you suggest?
P.s The step by step instructions are great, would love some pictures to go with!

So I use this recipe to infuse coconut and light-tasting vegetable oil like canola. I mostly use vegetable oil in my recipes, but each individual recipies will tell you which type of oil to use.
I also do not recommend using flavorful oils like olive oils since the flavor can/will deteriorate with the long cooking process.

Pictures are coming! ?

david stanley stanley

would it be the same with cbd flowers/buds?Would the need decarbing to? They are legal in the UK and only have 0.2%thc. could I use this method to make cbd oil? If I used less oil would that up the strength because I tend to enjoy just taking drops from an eye bottle dispenser ? Woiuld you recommend MCT oil?
Thank you sorry to ask so many thingsDavid

No problem at all!
So yes CBD flower would need decarboxylating and you can use this method to make some CBD oil. To decarb CBD, you will need to cook it longer. There is a lot of debate on how to properly decarb CBD stains since they take longer or a higher temperature. I recommend aiming for 240F for 60 to 90 minutes to decarb CBD flower.

And yes you can reduce the amount of oil to have a more potent oil. If you want, you can also use the Loud Bowl’s potency calculator, found in the menu, to estimate the amount of oil required for the potency you want.

Finally, I do recommend MCT oil as it is tasteless, well absorbed by the body and it has a longer shelf life ( if well stored). I personally don’t use it simply because of the higher cost compared to traditional vegetable or canola oil.

Thanks for the recipe and information! I’m decarbing some high CBD (AC/DC) flower, and tried using tin foil and the ring on the mason jar, but still ended up with a smelly house. The last time I decarbed in the house with a pan enclosed in an oven bag with no smell. I was wondering if there is a reason why you don’t use the normal mason jar top and lid when decarbing, and infusing in the crock pot?

I’m sorry this technique didn’t work for you.
I don’t use the normal mason jar top and lids to not end up with a jar that I can’t open later because of the vacuum that can be created.

i have seen mason-jar recipes that use the mason jar top and ring but suggest putting the ring on upside-down to avoid the accidental-vacuum-seal problem or at worst bursting of the jar. Since I don’t have a mason jar yet, I can’t quite picture this, but just FYI. Other people “burp” the mason jar occasionally for the same reason.
I’ve heard great things about the oven bag method for decarb being virtually odor-free.

How did you come by your decarbing times/temperatures?

They vary widely from site to site

Decarbing temperature will often range from 220F to 250F, and time will range for 30 to 60 minutes. There are charts that exist that shows the best combinations of time to temperature ration for optimal THCA to THC conversion, but most are too broad ( make no distinction between kief and flower per example) or outdated.

I based my decarbing temperature from Marijuana Growers HQ’s research, which recommends 240F for 60 minutes, but reduced the time to take into account the fact that the mason jar will retain heat after being removed from the oven. I also found through experimentation that a decarbing at 240F for 60 minutes gave me a decarbed cannabis that was too dark and dry, and edibles that were less potent. I then experimented and reduced that time and found the perfect sweet spot for me and my oven.

I hope this helps ?

Start it out at 220 degrees for a half hour. You will know when it is done by the color change. It will still be green but it will change to a light brown hue. That is just a Baseline when they tell you to go 240 degrees for 40 minutes! That is for fresh flower. Since the flower will decarboxylate overtime it is hard to have a say all end all time reference. Simply because nobody knows how old their weed is unless it’s homegrown. Not to mention how it was stored which also affects the decarboxylation process. Again I would just go 220 for a half hour and see where you’re at

Thanks for sharing! This is great! What is the alternative if I don’t have a crock pot? Will a normal metal pot do and do I have to line with a towel? I’m also worried the glass will burst while boiling? Sorry I am very new to this and have never done before. Thanks again!

You can do it in a saucepan if you want. I do recommend adding the towel on the bottom of the pot so that the jar doesn’t rattle around, but you don’t have to.
As mentioned in the post, the water should NOT be boiling, so the jars should be fine.

If the smell is not one of your preoccupations, you could also use a double boiler method. Put the oil in a bowl and place it over your pot of simmering water. The double boiler will gently heat your oil while keeping a constant temperature. The smell will be greater but there is no risk of a jar breaking in this scenario. Just make sure that there is enough water at all times.

I make shatter with grain alcohol. I freeze the flower and everclear to get as cold as possible. Then i soaked the buds for about an hour to 1.5 hours. I strain through bleach free coffee filters then i put the strained infused grain alcohol solution into a long pyrex dish. I use at 14 gs of flower in a jar and fill the jar up just over the top of the flower and break up the flower a bit after the first and second wash. I do 3 washes and use 3 different pyrex dishes to get 3 batches. To evaporate and decarboxilate the cannabis/grain alcohol solution i turn my toaster oven to 245 to 265 degrees on broil and instead of putting the pyrex dishes inside i put them on top one at a time and use a lid and screen to keep dust out. And i use a fan to blow over the top of it to help with evaporation. The reason the temp is higher is because its outside the toaster oven and the fan reduces the heat as well. I let the solution evaporate until the alcohol is mostly evaporated or around 60 minutes and by this time it has the consistancy of syrup.i remove and roll the syrup around the pyrex pan until it dries and place back on the toaster oven for 10 minutes or so when it becomes hard. Ive been able to make some awesome crystals that are equivalent to rock candy in hardness and consistency. And its really good. I dab just a small amount 3 times a day and i can make an oz of flower last 4 to 6 weeks. The shatter is normally a yellow to dirty yellow color smell awesome and is easy to store with no mess. My question is am i doing anything wrong. And what does good shatter look like and is it supposed to look like yellow or dirty yellow rock candy.also what kind of oil can i use to make vape oil outta the shatter for vaping. And whats the best process for making vape oil this way.

Unfortunately, I’ve never made shatter or oil for vaping so I can’t help you with that.

How to make potent cannabis oil that can be incorporated into any infused treats. This canna-oil making technique is mess-free, stress-free, and smell-free.