I think my maternal grandfather died of a stroke, although it could have been a heart attack - it happened before I was born, and he died a week after his wife, my grandmother, died from TB. My paternal grandmother died in an insane asylum, probably of neglect; my grandfather, from lung cancer after fifty years of smoking. My father was pretty healthy, except for "smoker's cough", until he dropped dead of a massive heart attack. My mother died from complications of diabetes, which she developed after a weight loss procedure that was popular in the early 1960s destroyed her thyroid gland. She had two sisters and a brother; one sister died of lung cancer after being married to a smoker for forty years, the other of congestive heart failure resulting from high blood pressure, and her brother died of colon cancer in his eighties. So I don't know what in particular I should be taking steps to prevent... and I'm too lazy to be paranoid about everything. (I was even nearly struck by lightning once, but it missed, so I know that's not what's going to kill me.)