Methamphetamine is a powerful, highly addictive stimulant that affects the central nervous system. Also known as meth, chalk, ice, and crystal, among many other terms, it takes the form of a white, odorless, bitter-tasting crystalline powder that easily dissolves in water or alcohol.
What Are Hallucinogens and Dissociative Drugs? Hallucinogens are a class of drugs that cause hallucinations—profound distortions in a person’s perceptions of reality. Hallucinogens can be found in some plants and mushrooms (or their extracts) or can be man-made, and they are commonly divided into two broad categories: classic hallucinogens (such as LSD) and dissociative drugs (such as PCP).
Opioid drugs include partial agonists, like the anti-diarrhea drug loperamide and antagonists like naloxegol for opioid-induced constipation, which do not cross the blood-brain barrier, but can displace other opioids from binding to those receptors. Because of opioid drugs' reputation for addiction and fatal overdose, most are controlled substances.
Drug and Substance Abuse. The abuse of drugs or other substances, whether they are illegal drugs or prescription drugs, alcohol, or tobacco is one of the nation's most pressing public health issues. Drug abuse occurs when people willingly consume illegal substances or legal, prescription drugs for the purpose of altering their mood, or getting “high”.
Harmful Chemicals in Tobacco Products Tobacco smoke. Cigarettes, cigars, and pipe tobacco are made from dried tobacco leaves. Other substances are added for flavor and to make smoking more pleasant. The smoke from these products is a complex mixture of chemicals produced by burning tobacco and its additives.