Respiratory failure and death may occur if used in combination with other drugs. Cannabis Cannabis alters mood and perception. Marijuana may cause confusion and loss of coordination. Long-term use leads to tolerance and psychological dependence. Users frequently begin using other drugs.
Marijuana contains higher levels of carcinogens than tobacco.
Hallucinogens Hallucinogens temporarily distort reality. Tolerance and psychological dependence develops. Birth defects occur in user's children. Overdoses cause convulsions, coma, and death. C. Mescaline, Ecstasy, and other designer drugs cause anxiety.