Here's how to care for an aloe vera of your own. About This Plant. There are hundreds of varieties of aloe plants, which are indigenous to Africa and a few neighboring areas. Aloes come in many varieties that range in size from a few inches to tree heights of 30 to 40 feet, in the case of the kokerboom (or quiver tree).
Marijuana smoke smoke contains a similar range of harmful chemicals to that of tobacco smoke (including bronchial irritants, tumor promoters and carcinogens) (Hoffmann et al, 1975).
Call it what you want, but marijuana has dangerous effects. Marijuana comes from the cannabis sativa plant. There is a chemical called delta-9-tetrahydrocannabinol (THC) in marijuana that makes it a mind-altering substance. People use marijuana in several ways. One way is rolling marijuana into a cigarette called a joint.