Some families are more susceptible than others. My cousin had a terrible asthma problem when her father smoked.
My friend's mother was a heavy smoker. Both her and her brother were born underweight.
Ayup. Mom smoked and I only weighed 5# 9oz. when I popped the hatch. Now I am 6 ft. 1 inch, weigh 235 (I could lose another 10#, but not much more before I start cutting the muscle mass.)
Mom fed me well. None of that preservative laced convenience food. Hmmmmm. Wonder how we ever got by without eating all those chemicals?