oral effects of tobacco cancer risk — Smoking is one the main causes of mouth cancer, significantly increasing risk. • Gum disease — Smokers produce more bacterial plaque and have reduced oxygen in Smoking: Effects, Risks, Diseases, Quitting

Smoking boomed in the first half of the twentieth century, thanks to heavy advertising and the inclusion of cigarettes as part of soldiers rations during the two world wars

Am J Phys Lung Cell Mol Phys 304(7):L489L503

Importance of prolonged smoking to disease risks The mid-century evidence on the disease risks attributable to smoking was not taken seriously, even in the countries where it was generated

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