Hallucinogens such as LSD and amphetamines cause illusions and hallucinations, and poor perception of time and distance. The effects of an overdose include psychosis and possible death. Marijuana and hashish can cause euphoria, increased appetite, relaxed inhibitions, and disoriented behavior. The effects of an overdose include fatigue, paranoia, and possible psychosis. Withdrawal symptoms include insomnia, hyperactivity, and decreased appetite.
Alcohol consumption causes a number of marked changes in behavior.
Even low doses significantly impair the judgment and coordination required to drive a car safely, increasing the likelihood that the driver will be involved in an accident. Low to moderate doses of alcohol also increase the incidence of a variety of aggressive acts, including spouse and child abuse. Moderate to high doses of alcohol cause marked impairments in higher mental functions, severely altering a person's ability to learn and remember information. Very high doses cause respiratory depression and death. If combined with other depressants of the central nervous system, much lower doses of alcohol will produce the effects just described.