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Marijuana is the most complex of all the street drugs. It has hundreds of known constituents Some are unique to the cannabis sativa plant and are classified as cannabinoids. Tetrahydrocannabinol – THC- is the psychoactive i.e. mind altering ingredient. Unlike alcohol that is water-soluble and eliminated from the body within twenty-four hours, cannabinoids are lipophilic i.e. they dissolve in fatty tissue. When a joint is smoked the cannabinoids enter the bloodstream via the t