title: Smoking habits and blood carbon monoxide levels.
mesh_terms: D002248:Carbon Monoxide / Q000097:blood*; D005260:Female; D006801:Humans; D008297:Male; D009790:Occupations; D005082:Physical Exertion; D011247:Pregnancy; D012907:Smoking / Q000503:physiopathology*; D013223:Statistics as Topic
chemical_list: D002248:Carbon Monoxide