Vocal cord dysfunction is a real possibility, especially if you have difficulty with inhaling. Reflux is indeed associated with both cough and asthma. Another cause could be anxiety, perhaps with a panic disorder. You and your doctor should consider investigation all of the preceding.
I've been smoking for 4 years but it feels like ive been smoking for 20. Im only 18 and i have breathing problems, i think i might have empeseyma or something but im not sure, when i go to sleep it takes a long time to fall asleep because of my breathing. I need advice.
It sounds like a panic attack!