Could be one of the worst ways to die, if not the worst. Smoking slowly kills your brain cells, rots your teeth, toughens your skin, wrinkles your face, messes your hair, ruins your esophagus, and gives your only brother stomach cramps that he doesn't realize are probably from smoking. Smoking causes plenty of cancer in the lungs, lips, gums, tongue, and pretty much everywhere else. It is probably the most unhealthy (legal) habit ever, and causes the death of somebody every ten seconds. Seriously, don't do it.
Emphysema (A pathological condition of the lungs marked by an abnormal increase in the size of the air spaces, resulting in labored breathing and an increased susceptibility to infection. It can be caused by irreversible expansion of the alveoli or by the destruction of alveolar walls), one of many illnesses that can be caused by smoking, has killed millions of people. Please don't let it kill my brother.