List of drugs that can be smoked

Plants:
 * tobacco
 * cannabis
 * salvia divinorum
 * opium
 * datura and other Solanaceae (formerly smoked to treat asthma)
 * possibly other plants (see the section below)

Substances (also not necessarily psychoactive plants soaked with them):
 * methamphetamine
 * crack cocaine
 * black tar heroin
 * phencyclidine (PCP)
 * synthetic cannabinoids (see also: synthetic cannabis)
 * dimethyltryptamine (DMT)
 * 5-MeO-DMT
 * fentanyl
 * many others, including some prescription drugs