In medicine, the term<unk>  describes any of the narcotic alkaloids found in<unk> um.
The main<unk> s derived from<unk> um are morphine, codeine, thebaine, and Papaverine. Noscapine, narceine and approximately 25 other alkaloids are also present, but have essentially little to no effect on the central nervous system, and are not usually considered to be<unk> s. The drug<unk> um is mostly produced in Asia.[citation needed]
Opiate
Heroin
Nicotine
Nicotine 
Benzidine
Cannabis 
Amphetamine
Phencyclidine