Smoking is very bad for you.
No, seriously. Smoking is astonishingly bad for you. Something like 15% of all deaths worldwide are attributable to tobacco smoking: about 8 million deaths a year, out of about 55 million. In India alone, it probably contributes to about 800,000 deaths a year, if my calculations (9% of all deaths in India; about seven people die per 1,000 in India per year; 1.3 billion people in India) are correct.