Heroin, commonly called smack, is chemically diacetyl morphine which is a white, odourless, bitter, crystalline compound. This is obtained by acetylation of morphine, extracted from the latex of poppy plant (Papaver somniferum), but Leaves of Cannabis sativa commonly called bhang produces cannabinoids.
Active chemical of Datura flower is tropane alkaloids mainly scopolamines, hyoscyamine and atropine.
Cocaine is extracted from the dried leaves and young twigs of Erythroxylum coca.

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