A substantially pure fraction of at least one cannabinoid is added to smokable or smokeless tobacco products to reduce the harm associated with tobacco use. The harm to be reduced includes irritation and carcinogenicity of tobacco. In a preferred embodiment a whole plant cannabis extract is mixed directly with the tobacco during the curing or manufacturing process. For cigarette applications the cannabinoids may be inserted into a cigarette filter, and/or paper. In other embodiments the cannabinoids are purified.