If weed is properly stored and dried it will not go bad.
If it’s stored improperly it may either become too dry (and lose its potency and taste) or it may go moldy (which makes it toxic to your respiratory system due to mold spores).
In some respect, cannabis is similar to dried kitchen herbs such as parsley, basil, oregano and such. Once the flowers are harvested, they are first dried — this is done by keeping the buds in a dark, room temperature place.
After that, the buds should be placed in an air-sealed jar where they go through a process called curing. The moisture content inside the buds is reduced to 62% and curing allows the buds to break down sugars and achieve maximum flavor and potency.
When you buy flowers from licensed producers you can rest assured that all buds are properly dried and cured.
Cannabis buds have one very dangerous archenemy — mold.
If the weed is cured and stored with too much moisture inside it, it can become moldy and unsmokable.
You can easily recognize moldy weed by closely examining the bud with a magnifying glass: the mold appears as a dense grayish cobweb on certain areas of the flower.
MMJDoctorOnline provides another alternative:
Grab a black light and illuminate the bud. Mold will appear as a distinctive green hue.
If you are thinking about smoking moldy weed, my recommendation is to avoid it at all costs. When you smoke mold, you inhale thousands of toxic spores, all of which can give you health problems, especially in your respiratory system.
If you’re buying from a licensed producer then rest assured that every product has been dried, cured and stored up to medical standards. If, however, you bought weed from an unknown source (which you should never do in the first place) then you need to double check its quality.
It takes experience to recognize a good, quality bud. Most importantly you have to answer the following questions:
There are, of course, plenty more ways to identify whether your weed is smokeable or not but your best bet is to stick to this:
By doing so, you will be always consuming high grade, fresh product with perfectly balanced taste and potency.