my dh is a smoker and man is he addicted.  erin, don't worry yourself.  what i am saying is like anything else you want to assess the health risks. for example in my family men dropped like flies from heart attacks at age 40.  what did my parents do?  they served up healthy meals and talked to us about the importance of exercise and NOT smoking.

i get on my soap box easily on drugs and alcohol.  of course i have witnessed the horror of it up close and personal.  however i have also seen up close and personal how much proper drug and alcohol education works too.  and parenting. talking to your kid (not lecturing) is important. imo no later than 6th grade there should be formal drug and alcohol education.

the combination of factors that led to my stepdaughter's addiction are complicated. there were many factors. she was at risk both from family history and others factors as well. it feels daunting when you have little ones and hear about kids who get into serious trouble.  of course no one is immune to bad things. however, it is clear you actively keep abreast of information. you will do just fine. i am really enjoying my daughter's teen years and i am not fraught with worry.