Studies of young and adolescent users of Ecstasy found that 43 percent were classified as dependant to the drug, as evidenced by continued use despite knowledge of physical or psychological harm, withdrawal effects, and tolerance.
It was discovered in the mid 1930s that anabolic steroids facilitate the steady growth of skeletal muscle in lab animals.
The brain registers the psilocybin in magic mushrooms as if it was the natural brain chemical serotonin, and produces its effects by disrupting normal functioning of the serotonin system.
Opiates are types of drugs that have been used for many years to treat pain.