toxic substances in cigarette smoke Chemicals Tobacco Products and Your Health Can a Cigarette Pack's Cancer
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Soft as cotton, Portugus Reds are still a smack to the face

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Similarly, having a smoking sibling did not show a significant association with smoking status ( 2 =0.07, df=1, p=0.789)

The key here is that no matter how old you are when you quit, doing so is the best decision you can make, according to Turowski

Wang T, Xia K, Qiu T, Han S, Chen Z, Ma X, et al

For example, a blood clot in the lung, or certain types of lung infections can be life-threatening and should be addressed as soon as possible