Changing to cigar smoking.
D000328:Adult; D002248:Carbon Monoxide / Q000097:blood; D002263:Carboxyhemoglobin / Q000032:analysis; D006801:Humans; D008297:Male; D008875:Middle Aged; D012906:Smoke / Q000032:analysis; D012907:Smoking
D012906:Smoke; D002248:Carbon Monoxide; D002263:Carboxyhemoglobin