My dad lives with smokers who live upstairs in the house and me and him stayed downstairs I lived with him for a year but don't anymore and they chain smoke upstairs and there is a door between dad and them and I visit him at least twice a week and spend the night when ever I have school off I'm 15 how long til I get lung cancer or what is my percentage of getting it at least I'm always scared of visiting him because of lung cancer my aunt and uncle died from that I don't want to some one please help your help is greatly appreciated