Dear Welcome to HCM We understand your concerns Gastric drangement can be due to sedentary life style, diet, lack of exercise, excess production of gastric juices etc., Smoking may not create gastric troubles but can enhance available symptoms. Controlled diet is very important as well as proper evacuation. Food goes through a series of bsorption procedures through body organs and finally unwanted items reach anal passage for evacuation. Delay in evacuation decomposes it and further gastric derangements occurs. Control your diet, exercise, and evacuate properly. Fsting once inn a week also help if the stage is beginning. Can have some antacid chewable tablets for immediate relief. Get well soon.