Outlaw motorcycle clubs like the Hells Angels first controlled the illegal production of methamphetamine in the U.S., although production and distribution of the drug is now mainly controlled by Mexican criminal organizations.
Long-term hashish users will inevitably develop a tolerance to the drug, needing larger doses of the drug to get the same desired results that he or she used to get from smaller amounts.
One man who was a chronic Salvia user was charged in a shooting spree that left six people dead and the attempted assassination of Representative Gabrielle Giffords.
Most opiate users continue to use opiates despite serious physical or psychological harm because opiate addiction can be so all consuming.