Yes definately smoking
Marijuana will further inflame the stomach so please start reducing so that you can ultimately stop.
For reducing inflammation in stomach following things can be done-
1-Avoid all spicy food, citrus fruits, tea and coffee.
2-Drink about 3lts of water in a day.
3-have food at regular intervals.
4- Avoid fasting.
5- take following medication for next 1month-
Tab Amla(gooseberry) 2tab twice before food,
2tab bed time.
tab yastimadhu(licorice) 2tab twice before food.
take 1glass of luke warm milk with 2tsf of cows ghee in it at night.