Hello, Let me tell you that you are worrying too much and that too without any valid reason. At your age boys masturbate and it is not at all unusual. At your age boys smoke too although I must tell you that smoking is not at all good for your health but it has hardly anything to do with your lack of erection. The problem is in your mind and you are thinking too much. It is also not unusual to experience erectile dysfunction at your age. I d like to tell you that you should take a break from masturbation, cigarettes, and stress for a month. Eat healthy food, drink plenty of water and sleep well. There are more chances that you will be alright and if the problem persists then you can talk to a doctor. Hope I have answered your query. Let me know if I can assist you further. Take care Regards, Dr Prabhash Verma, General & Family Physician