I am 17 years old and turning 16 this month. I have been smoking marijuana and cigarettes for nearly three years or maybe less. I have been feeling pressure or a bubble like feeling in my left lung. I have really bad anxiety when it comes to thinking that I have cancer. It paranoids me. I also feel that my left lung is larger than the other when I breathe in and look down. But, I have not been having the main symptoms of cancer like coughing blood, peeing blood, loss of appetite, etc. I have been dizzy, but that is when I get up from sitting and I think that is normal. I went to the hospital a year ago as I had so much anxiety about the possibility of developing lung cancer and death. Then did x-rays and scans, But they found nothing and sent me home. They said it was chest wall pain. I just want to know, is it possible that I could have lung cancer? Can someone as young as me get lung cancer? If it is not lung cancer, then why am I expericing this discomfort in my left lung?