I have the constant need to try and achieve a deep breath. every 20-30 seconds i attempt to take a deep breath. this worsens with exercise. thoughts?

Need some testing: Obviously you've had some testing done to this point and I'm sure someone has already thought of the usual suspects such as asthma, allergies, and pulmonary diseases (others) though you're very young for that even if you've been smoking for awhile.....Have you pulmonary function testing done yet? I think if that's normal then, you're in good shape.