title: Carbon monoxide levels and rates of consumption after changing to low tar and nicotine cigarettes.
mesh_terms: D000328:Adult; D000368:Aged; D002248:Carbon Monoxide / Q000097:blood*; D006801:Humans; D008875:Middle Aged; D009538:Nicotine / Q000008:administration & dosage*; D000074606:Smoking Prevention
chemical_list: D009538:Nicotine; D002248:Carbon Monoxide