Addiction

The state of being compulsively committed to a habit or practice or to something that is psychologically or physically habit-forming, as narcotics, to such an extent that its cessation causes severe trauma.

Blood alcohol content

The percentage of alcohol in the bloodstream: under the laws of most U.S. states, a BAC of 0.08 or higher is the legal definition of intoxication.

Cannabis

A plant of the genus Cannabis, most notably hemp, C. sativa:

Carcinogen

Any substance or agent that tends to produce cancer.

Dependence

The state of relying on or needing someone or something for aid, support, or the like.

Depressant

Medicine/Medical. having the quality of depressing or lowering the vital activities; sedative.

Detoxification

Biochemistry. the metabolic process by which toxins are changed into less toxic or more readily excretable substances.

Drug

A chemical substance used in the treatment, cure, prevention, or diagnosis of disease or used to otherwise enhance physical or mental well-being.

Hallucinogen

A substance that produces hallucinations.

Inhalant

A medicine, allergen, or other substance that is inhaled.

Intoxication

Inebriation; drunkenness.

Naloxone/Narcan

An opioid antagonist, C19H21NO4, used to reverse the acute respiratory depression that occurs with opioid overdose.

Nicotine

A colorless, oily, water-soluble, highly toxic, liquid alkaloid, C10H14N2, found in tobacco and valued as an insecticide.

Opiate

Biochemistry, Pharmacology. a drug containing opium or its derivatives, used in medicine for inducing sleep and relieving pain:

Overdose

An excessive and dangerous dose of a drug.

Potency

The state or quality of being potent.

Prescription drug

A prescription drug is a pharmaceutical drug that is permitted to be dispensed only to those with a medical prescription.

Psychedelic drug

Psychedelics are a subclass of hallucinogenic drugs whose primary effect is to trigger non-ordinary mental states and an apparent expansion of consciousness.

Recovery

An act of recovering.

Relapse

To fall or slip back into a former state, practice, etc.:

Sedative

Tending to calm or soothe.

Stimulant

Physiology, Medicine/Medical. something that temporarily quickens some vital process or the functional activity of some organ or part.

Tobacco

Any of several plants belonging to the genus Nicotiana, of the nightshade family, especially one of those species, as N. tabacum, whose leaves are prepared for smoking or chewing or as snuff.

Tolerance

A fair, respectful, and permissive attitude or policy toward people whose opinions, beliefs, practices, racial or ethnic origins, etc., differ from one’s own or from those of the majority; freedom from bigotry and from an insistence on conformity:

Withdrawal

The act or process of ceasing to use an addictive drug.