Would you be surprised if heroin addicts have chronically high blood harman levels? They do. Two of the most abundant sources in the human diet are coffee and t

Would you be surprised if heroin addicts have chronically high blood harman levels? They do. Two of the most abundant sources in the human diet are coffee and tobacco smoke. It has been postulated that some alcoholics use alcohol as a means to escape the anxiogenic (anxiety-generating) effects of harman.