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So, the issue of smoke ageing which is central in the assessment of ETS toxicity, should be considered with even more caution in the case of hookah smoking simply because, and as strange as it may be, the smoke covers a distance of about 25 times that of cigarette

Indeed, smoking is thought to be the cause of almost half of the 12 most common cancers

If your citys fine PM levels were compliant with the US national standard of 35 mcg/m^3, then in the worst case scenario youd be breathing in about 630 micrograms of particles per day, which is about 0.05 cigarettes (1 cigarette every 20 days)

Integration from proteins to organs: the physiome project