1. Psychology
... pain. Heroin can be injected into a vein or a muscle, smoked in a water pipe, inhale as smoke through a straw or snorted as powder via the nose. Cocaine is a powerful central nervous system stimulant that heightens alertness, inhibits appetite and the need for sleep, and provides intense feelings of pleasure. Cocaine's short-term effects appear soon after a single dose. Marijuana is usually smoked ... health risks. In general, chronic exposure to nicotine may cause an acceleration of coronary artery disease, peptic ulcer disease, reproductive disturbances, fetal illness and death. Tobac...
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