Hello there,
The symptoms you are experiencing are not typical
nicotine withdrawal symptoms. If anything you should be breathing better considering you have cut down on
smoking. Waking up breathless at night, on when lying flat is a possible sign of cardiac disease. If you are a snorer, and if you are
overweight, obstructive sleep apnea(a condition in which your airway is obstructed during sleep) is another possibility. Is sleep productive or are you tired during the day ? Please visit your doctor and get evaluated for the same. Best of luck with your fight against cigarettes.
Nicotine does not produce major physical withdrawal symptoms, the irritability and craving after quitting smoking may reach a peak in and around 4 days and will subside soon after. When it comes to cigarettes, quitting
cold turkey is the way to go. Find alternative activities, such as exercise or
yoga to keep your mind off smoking. The brain needs time to kick it's
nicotine dependence. You could also ask your doctor about
varenicline, a drug that helps you quit.
For now, please visit a doctor and evaluate yourself for the breathlessness. It is highly unlikely that it is related to you cutting down on smoking.
Wishing you the best of health.