What is 'passive smoking'?

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It is heartening to know that if one had not had any heart attack earlier and he stops smoking, his chances of having a heart attack drop to that of a non-smoker in about six months' time. Stopping of smoking is also the single most effective means of secondary prevention (recurrence of a heart attack) in heart patients.     Smoking leads to pain and stiffness in the legs while walking. No amount of drugs can help. The only remedy is to give up smoking. If women smoke during pregnancy, there is an increased risk of death of the baby in the womb or soon after birth. Even where the baby... Show more

What is 'passive smoking'?