Withdrawal from certain drugs such as benzodiazepines or alcohol can be fatal and therefore the abrupt discontinuation of any type of drug is not recommended.
Opiates such as heroin convert to morphine in the body which then activates opiate receptors located throughout the brain and central nervous system, including within the reward system.
The chemical structure and effects of Ketamine are very similar to those of PCP, although it is much less potent than PCP and the effects are of much shorter duration.
Statistics show a recent increase in daily marijuana use among 8th, 10th, and 12th graders, most notable among 12th graders at 6.1%, highest since the early 1980s.