I m having worries about secondhand smoke , and it s affect on my height, I ll be 16 in December and that s all I can ever think about. My parents and brother smoke and back when I was 10 or so until now, they have usually smoked in the car. I m 5 6 at the moment, almost 5 7. So will smoking decrease my FINAL height? I m talking about my greatest possible height. I have read that smoking causes your hormones to not function properly and I m wondering if that is why it may stunt growth due to lack of HGH. Smoking also makes you look older, and HGH is responsible for that as because when you get older, HGH is produced much less causing your skin to wrinkle , loss of energy etc. THE QUESTION IS - Does secondhand smoke affect your FINAL height?(not growth rate, ONLY final height please) if so, is there anyway for me to gain it back?