Comparative Study

Waterpipe tobacco and cigarette smoking: direct comparison of toxicant exposure.

Am J Prev Med. 2009 Dec 1; 37 (6): 518-23.
Article

Effect of cigar smoking on carboxyhaemoglobin and plasma nicotine concentrations in primary pipe and cigar smokers and ex-cigarette smokers.

Br Med J. 1977 Nov 26; 2 (6099): 1387-9.
Article

Elevated carboxyhemoglobin: sources of carbon monoxide exposure.

Arch. Bronconeumol. 2014 Nov 1; 50 (11): 465-8.