The brains of Ecstasy users who experience serotonin depletion because of their Ecstasy will take a significant amount of time to restore the level of serotonin needed to perform important physiological and psychological functions.
The most recent national and state surveys indicate that inhalant abuse reaches its peak at some point during the sixth through the ninth grades.
The rate of high school students in the U.S. reporting PCP use at least once fell from 13% in 1979 to less than 3% in 1990.
Valium dependent individuals eventually have to take more and more Valium more frequently to achieve the desired effects, and this can happen when someone is legitimately prescribed the drug or abusing the drug illicitly.