Heroin is a highly addictive drug, and its use is a serious problem in America. Current estimates suggest that nearly 600,000 people need treatment for heroin addiction. Recent studies suggest a shift from injecting heroin to snorting or smoking because of increased purity and the misconception that these forms of use will not lead to addiction. Marijuana is the most commonly abused illicit drug in the United States. It is a dry, shredded green and brown mix of flowers, stems, seeds, and leaves derived from the hemp plant Cannabis sativa. The main active chemical in marijuana is delta-9-tetrahydrocannabinol; THC for short. Makers of ecstasy can add anything they want to the drug. So the purity of ecstasy is always in question. Other chemicals or substances are often added to, or substituted for, MDMA in ecstasy tablets, such as caffeine, dextromethorphan (in some cough syrups), amphetamines, or cocaine. | 
