title: Cigarette tar reduction.
mesh_terms: D003033:Coal Tar / Q000032:analysis*; D006801:Humans; D008297:Male; D009538:Nicotine / Q000097:blood; D010947:Plants, Toxic; D012907:Smoking; D014026:Nicotiana / Q000032:analysis*
chemical_list: D009538:Nicotine; D003033:Coal Tar