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 * many others, including some prescription drugs