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).
The study found that heroin, crack cocaine and meth were the most harmful drugs to individuals, while alcohol, heroin, crack cocaine and cannabis were the most harmful to others. Overall, alcohol was found to be the most harmful, followed by heroin, crack cocaine, meth and tobacco. Cannabis came eighth down the list.