Marijuana use produces many adverse physical, mental, emotional, and behavioral effects.
Over 30 percent (658,263) of all drug abuse emergency room visits in 2009 involved the use of alcohol, either alone or in combination with another drug.
When taking into account the negative health consequences and trafficking related violence as measuring tools, cocaine is just behind heroin as the second most problematic drug in the world.
Drug craving and depression that an individual experiences during crack withdrawal can last for months following cessation of long-term heavy use of the drug.