i quit smoking in April of 2017 after smoking for 50 years. Wow!  I never thought I could quit but with Gods help I did it. After about a week I too started having severe bloating and weight gain. Some of the weight gain I can account for since I used cheese it crackers to help with the hand to mouth urge. My sister quit smoking a few years ago and she said it takes about six months to start feeling relief from the bloating. I have found eating celery carrots and drinking lots of water helps. My metabolism is so slow I feel it is as slow as if I weight 300 lbs. I guess more activity will help to make it speed up gradually.