C. Depressants, Barbiturates, and Tranquilizers . Depressants, barbiturates and tranquilizers have depressing effects on the central nervous system and can lead to physical and psychological dependence. These drugs are very popular and are overused by Americans. D. Cocaine . It is an up-scale drug used by people in many professions, despite its illegal status.
Regular use can lead to depression, weight loss, paranoia, and hallucinations.
These effects and the more positive ones associated with cocaine are similar to those caused by amphetamines. Cocaine is a powerful drug that overstimulates the central nervous system and produces an artificial euphoria. Even the occasional user takes dangerous chances, but chronic use can create a harmful dependency that affects behavior and multiplies health risks. E. Opiates . Heroin is the opiate that is of most concern to law-enforcement officials.