title: Long-term switching to low-tar low-nicotine cigarettes.
mesh_terms: D000328:Adult; D002245:Carbon Dioxide / Q000097:blood; D003367:Cotinine / Q000097:blood; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009538:Nicotine / Q000032:analysis*; D010947:Plants, Toxic; D012907:Smoking; D013638:Tars / Q000032:analysis*; D013861:Thiocyanates / Q000097:blood; D014026:Nicotiana / Q000032:analysis*; D014029:Tobacco Use Disorder / Q000097:blood
chemical_list: D013638:Tars; D013861:Thiocyanates; D002245:Carbon Dioxide; D009538:Nicotine; D003367:Cotinine