I am a smoker and usually i smoke 3 cigarettes a day and sometimes i smoke just before I sleep and I wake up suddenly in mid night maybe 4 or 5 am and notice shortness of breath , I find difficulty in smoking I've to struggle or put an effort to breath in and out and dizziness too... It happens to me moslty when I smoke just before i sleep it happens 3 to 4 times in a month and I really feel suffocation when it happens feel chest is heavy. Is it something serious issue? What it might be most probably? How can I overcome this health issue? And also please let me know any replacement which may help to quit smoke which can be available easily I am on BP tab met Xl 12.5