I was just 11 when I started smoking in the 1980s. Finding cigarettes was easy. My mom was a smoker, and when she reached the end of a pack, she’d send me with a dollar to the corner store to buy more. Back then, there were no laws against selling tobacco products to kids, so the store clerk thought nothing of it.

Sometimes, I’d sneak cigarettes from my mom’s supply. Other times, I’d get them from the “cool” kids at school who...