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When heated, irritant formaldehyde gas evolved from solution. The main products of decomposition are carbon monoxide and hydrogen. Metals such as platinum, copper, chromia, and alumina also catalyze the formation of methanol, methylformate, formic acid, carbon dioxide, and methane.
Acetaldehyde is in fact the most abundant carcinogen in tobacco smoke, and dissolves into saliva when smoking. Both acetaldehyde and formaldehyde cause irritation of the skin, eyes, throat, mucus membranes, and respiratory tract. 1,3-Butadiene. 1,3-butadiene is a simple hydrocarbon molecule, containing 2 double bonds.