When stored properly (more on this later), dried cannabis keeps for 6 months to 1 year. Over time, it begins to lose its aroma and potency.
In people with weakened immune systems, inhaling smoke or vapors from weed containing bacteria or fungi could cause serious illness or even death.
And forget those funny little tins, too, because they let in too much oxygen.
Even if your weed isn’t super old, it’s best to do a mold inspection. A study by researchers from University of California, Davis found bacteria and mold on 20 cannabis samples bought from dispensaries and pot growers in Northern California.
According to some older research, weed loses roughly 16 percent of its THC after 1 year, and it just keeps dropping from there:
Ditch plastic baggies and containers. Plastic holds static that can affect delicate trichomes — the tiny, crystal-like hairs on flowers that produce cannabinoids and terpenes — and mess with potency.
Consuming it shouldn’t harm you, but be prepared for changes in texture and potency. The exception is weed that’s grown mold, which could potentially make you sick.
Light, humidity, temperature, and oxygen can all mess with cannabis and affect its aroma, taste, and potency potential.
Mold is often hard to see unless you look very closely. It typically looks like white powdery or fuzzy spots, some of which can be pretty small.
Weed doesn't go bad in the way perishable food does, but it can definitely degrade over time. Here's what to look for.
Similarly, and probably more importantly, cannabinoids also break down over time. Old, worn out bud won’t be as potent because a lot of the THC will have broken down and dissipated.
Now that you know the answer to the question, how long does weed stay good, what should you do to keep it fresh? To preserve your bud for as long as possible, practice proper storage techniques.
To accomplish all this, store your bud in either a small glass Mason jar or a container designed specifically for marijuana. Keep the lid on tight, don’t open it very often, and keep it in a cool dark place.
Now that you have a general idea for how long does weed last, let’s get into the more scientific answer. First, it’s important to understand what actually happens to marijuana as it ages.
Different cannabis products have slightly different needs if you want to keep them fresh and potent. Here’s a quick breakdown of how to keep different cannabis products fresher for longer:
But smoking old weed won’t kill you or make you sick. The only exception is moldy marijuana. If your flowers have encountered too much moisture they might get moldy.
If you see discolored spots, white fuzzy mold, or if it smells like anything other than cannabis, don’t mess with it. Smoking or otherwise ingesting mold can definitely make you sick or worse, so steer clear.
Let’s get to the heart of the matter. How long is weed good for? Under ideal storage conditions, cannabis can actually stay relatively fresh for a surprisingly long time.
It’s a classic scenario: you’re out of bud and in your frantic search for more you discover a long-forgotten baggie of flower somewhere in the back of your closet. You’re excited about your find. But wait: how long does weed last? How long is weed good for? Can you still smoke that old, dried out marijuana? How long does weed stay good, and what happens if you smoke weed that isn’t fresh? This guide has all the information you need.
At some point, most weed smokers find themselves asking, how long does weed last?