Hello,
While having never consumed that substance, I have been around many people who did at the time.
Coughing is to be expected when smoking pot (cause you usually mix it with tobacco), tobacco or when vaping.
After all, you are putting something in your body that shouldn't be in your body. Your body reacts.
2 hits a night to relax is 2 hits more than you should do. Please look for healthier ways to relax (void meditation, taking a shower, reading).
Also consider using the color Blue, as it is related to "inner peace".
You may want to consult the following pages:
Quitting will help you with meditation, and basically everything else in your life.
The closer your body's chemistry is to being balanced, the better it is.
When you smoke pot, tobacco or vape, or drink alcohol etc., you are upsetting the chemical balance of your body.
I hope this was helpful.
Sincerely,
HDNW.