Cocaine is a strong central nervous system stimulant. Physical effects of cocaine use, including crack, include constricted blood vessels and increased temperature, heart rate, and blood pressure. Users may also experience feelings of restlessness, irritability, and anxiety 10% of the 2,000,000 people who take heroin every year in the United States actually use the drug habitually (approximately 220,000) Data has shown that people high on marijuana show the same lack of coordination on standard "drunk driver" tests as do people who have had to much to drink. Research suggests that people who used ecstasy at least 25 times had lowered serotonin levels for as long as a year after quitting. |