Console yourself with self-deception. Do not smoke? You do not want to die...
To find out whether smoking served as a catalyst in the deterioration of the health of the patient can even a doctor. The answer is always "yes". Yes, and lung cancer (and a pot of other related diseases) like no one has cancelled.
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And even a doctor-double knows exactly that all who used dihydrogen monoxide, or have already died, or will die in the near future, and this most harmful of the fluids should be banned. But even he, instead of a diagnosis of a heart attack, will never write a death from smoking because he knows the difference between what served as a catalyst and what caused it. In addition, the catalyst could have been yesterday's triple hamburger, because the heart attack is not written who helped him.