They distort perception, affect sensations and impair memory. Cocaine can produce psychological and physical dependency. Effects of the use of crack include increased pulse rate, insomnia, loss of appetite, tactile hallucinations, paranoia and seizures. Crack is far more addictive than heroin or barbiturates. Repeated use of crack can to lead to addiction within a few days.
Continued use can produce violent behavior and psychotic states similar to schizophrenia.
Cocaine in any form, but particularly crack, can cause sudden death from cardiac arrest or respiratory failure. Marijuana - Marijuana may increase the heart rate, produce bloodshot eyes, a dry mouth and increased appetite. It may impair short term memory, alter sense of time and reduce the ability to perform tasks requiring coordination and concentration. Research show that motivation and cognition may be altered and that marijuana can cause severe psychological damage. Narcotics - Narcotics produce a feeling of euphoria that is often followed by drowsiness, nausea and vomiting.