<unk>  are a group of terpenophenolic compounds present in Cannabis (Cannabis sativa L). The broader definition of<unk>  refer to a group of substances that are structurally related to tetrahydrocannabinol (THC) or that bind to<unk> receptors. The chemical definition encompasses a variety of distinct chemical classes: the classical<unk>  structurally related to THC, the nonclassical<unk> , the aminoalkylindoles, the eicosanoids related to the endocannabinoids, 1,5-diarylpyrazoles, quinolines and arylsulphonamides and additional compounds that do not fall into these standard classes but bind to<unk> receptors.
The term<unk>  also refers to a unique group of secondary metabolites found in the cannabis plant, which are responsible for the plant's peculiar pharmacological effects. Currently, there are three general types of<unk> : herbal<unk>  occur uniquely in the cannabis plant; endogenous<unk>  are produced in the bodies of humans and other animals; and synthetic<unk>  are similar compounds produced in a laboratory.
Cannabinoids
Opioid
Heroin
Indole alkaloid
Polycyclic aromatic hydrocarbon
Cannabis 
Opiate
Nicotine 