Cannabis - a tall plant with a stiff upright stem, divided serrated leaves, and glandular hairs. It is used to produce hemp fibre and as a drug. 
​A dried preparation of the flowering tops or other parts of the cannabis plant, or a resinous extract of it ( cannabis resin ), smoked or consumed, generally illegally, as a psychoactive (mind-altering) drug.

​Tetrahydrocannabinol (THC) is a psychoactive substance

Cannabidiol (CBD) does not have the same psychoactivity as THC and may change the effects of THC on the body if both are present.

To learn more about mixing cannabis and ecstasy and its side effects, please go to section describing MDMA drug.