--is how the numbers would stack up for people who didn't put cigarettes in their mouths, but were exposed to tobacco smoke on a constant basis.

I've never touched a cigarette, a cigar, a joint--anything. Mostly that's because both of my parents had two-pack-a-day habits, and I remember my early years being a haze of smoke. I was asthmatic early in life--interestingly, I have had no attacks/symptoms since late high school (I was away for college).

My dad finally quit at age 62 after the second heart attack and bypass. Mom still puffs (at age 72).