A new study shows that the concentration of polycyclic aromatic hydrocarbons (PAHs) in smokeless tobacco products (STPs) can differ by as much as 60 fold, with the highest levels in moist snuff, and dry snuff and soft pellets; the lowest levels were in snus. Higher levels can be explained by the use of of fire-cured tobaccos in the products. The source of the trace amounts of PAHs in snus and other products using non-fire-cured tobaccos was previously unknown. The results of this study indicate the source to be environmental pollution, such as car exhausts and agricultural and wood fires...
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