Most people can walk away from high drug use if their lives become more normal. The British journal New Scientist reports research that found the majority of those who become dependant on Cocaine return to moderate use or total abstinence without treatment. Finally, Florida State University conducted a study for the Florida legislature of 45,096 people arrested for drug possesion in 1987. Eighty-eight percent had never been arrested for property crimes like burglary. Relying on these and many other studies, the Washington-based Drug Policy Foundation, a beacon of reason in a sea of hysteria, offers the following framework.
Stress causes drug use.
The vast majority of those who use drugs are casual users. Those who use drugs tend not to commit other crimes. Drugs in the workplace are not a serious burden on productivity. Which isn't to say there is no problem. But it's a problem caused more by making drug use a crime than by the use itself.