Low-tar smoking versus middle-tar smoking.
D005260:Female; D006801:Humans; D008297:Male; D009538:Nicotine / Q000032:analysis; D010947:Plants, Toxic; D012907:Smoking; D013638:Tars / Q000032:analysis*; D014026:Nicotiana / Q000032:analysis*
D013638:Tars; D009538:Nicotine