I believe that smoking can depress the appetite. I'd start with quitting the smoking first. You've heard that people start gaining weight after they stop smoking....
I believe also that long term use of smoking can also cause ulcers, because the gastric juices are stimulated with the activity in the mouth with the cigarette. I'd read up on it, and then decide.
If you are able to do that, I'd suggest staying with high calorie nutritious wholesome foods. Avoid processed foods, as much as possible - especially the high calorie low nutrient varieties.
I've watched too many adults try to quit smoking. It's really tough. I hope that you can. It's so hard, knowing about those nicotine drugs - and what they do to us.
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