It is a great idea for you to stop drinking completely. The condition called 'Asian flush' is an indicator of a lack of a certain enzyme normally responsible for breaking down acetaldehyde in alcohol. If you have 'Asian flush' and continue drinking even one ore two drinks a day, you will have six to ten times the risk of developing esophageal (food pipe) cancer as a drinker not deficient in this enzyme.
I would not be worried about your liver, since you have only been drinking for two years, and if you are nor having issues after a week of sobriety, you should be OK if you just continue being sober.
Chewing tobacco also is not a healthy habit as you are well aware, as it may cause mouth cancer which is not only deadly but is very disfiguring and not very sexy (if you know what I mean).
Please think of how young you are and how much you still need to accomplish in life! Take care of yourself and your body. You only have this one. Good luck and stay well.