Most studies of the health hazards of drugs compare the health of drug users with nonusers.
Any chemical that, when consumed, alters an organism's physiology or psychology is considered a drug. Drugs are usually distinguished from food and other substances that support nourishment. It is possible to consume drugs through inhaling, injecting, smoking, ingesting, applying a patch to the skin, using a suppository, or dissolving them under the tongue.
Depressants. Depressants are among the drug categories that are most often used in society. Stimulants. The converse is true with stimulants like nicotine or coffee. Opioids. The opioid addiction issue has had a severe impact on our society. Hallucinogens.
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