Cannabis, AKA marijuana, is a phychoactive drug that can be used for medical or recreational reasons.  
It's quite an interesting drug, can you tell me more about it?
Sure!  Cannabis can be used by smoking, vaporizing, or in food.
Interesting, are there any chemicals in it specifically that make it psychoactive?
Cannabis (drug)
Cannabis, also known as marijuana among other names, is a psychoactive drug from the "Cannabis" plant used for medical or recreational purposes. The main psychoactive part of cannabis is tetrahydrocannabinol (THC), one of the 483 known compounds in the plant, including at least 65 other cannabinoids. Cannabis can be used by smoking, vaporizing, within food, or as an extract.
Cannabis has mental and physical effects, such as creating a "high" or "stoned" feeling, a
or hashish cigarettes is destroyed by pyrolysis during smoking.
Other drugs.
Vaporizers can be used to inhale other recreational drugs as well. A wide variety can be consumed this way, either dissolved in e-liquid or vaporized directly. The use of e-cigarettes to inhale the psychedelic drug DMT has been reported.
Medical vaporizers.
Studies have shown that vaporizing cannabis exposes the user to lower levels of harmful substances than smoking cannabis. These findings are important for it is estimated that 10–20 percent of patients with