While relatively rare, flashbacks the spontaneous reappearance of the drug experience after use has ceased may occur. Tolerance, especially at the euphoric effect of narcotics and physical dependence, develops rapidly. In order to avoid the abstinence syndrome, the addict becomes preoccupied with acquiring the drug. Withdrawal symptoms are extremely uncomfortable, however, they are seldom life threatening. High doses of stimulants result in intense personality disturbances including visual and auditory hallucination, delusions, and paranoia.
Tolerance develops rapidly.
The use of cocaine can cause death by cardiac arrest or respiratory failure. Stimulants are addictive, and while withdrawal from stimulants is less dangerous than with depressants, depression can make a person vulnerable to suicide. THC is fat soluble and can remain in the body up to three weeks after smoking one marijuana cigarette. Consequently, even the occasional user can be detected through urinalysis. Research indicates that regular use may have long term effects on the user's brain, heart and reproductive organs.