It is used in pill form, or in powdered form by snorting or injecting. Crystallized methamphetamine is a smokable and more powerful form of the drug. Methamphetamine use can cause irreversible damage to the brain, producing strokes and convulsions, which can lead to death. Opiates Opiates are any of the addictive narcotic drugs. The opiates include drugs such as morphine, heroin and codeine.
Opiates can reduce attention, sensory and motor abilities.
Marijuana is commonly taken by smoking, but it may also be eaten. Marijuana may impair learning and coordination abilities. Low concentrations of THC persists in urine at a detectable concentration for many days after smoking.