title: Letter: Nicotine availability as a factor in tobacco consumption.
mesh_terms: D002248:Carbon Monoxide / Q000032:analysis; D005602:France; D006801:Humans; D008722:Methods; D009538:Nicotine / Q000032:analysis*; D010947:Plants, Toxic; D012907:Smoking; D013638:Tars / Q000032:analysis; D014026:Nicotiana / Q000032:analysis; D006113:United Kingdom
chemical_list: D013638:Tars; D009538:Nicotine; D002248:Carbon Monoxide