I am a 16 year old female, i have smoked for two years. When i walk a bit i get out of breath, begin to feel dizzy and im gasping for breath. I do not know what it is. But it is horrible. Even when i have tried to quit smoking and i have'nt had a ciggarete it still happens. I am quite concerned. My boyfriend has smoked for 4 years and smokes a lot more than me and never gets out of breath like me.