Well, I know that if I over do the smoking of pot that I can inadvertantly swallow too much air when I smoke and feel a little queasy from that or if I take an enormous hit I get the whole gag reflex thing going on... if you've been sick, I can see why it's probably affecting you the way it is. As for cigarettes, I quit that crap because I was always getting this reoccuring stomach cramp and I do recall that I did feel more queasy when I was smoking both cigarettes and pot. Right now I'm finally getting over a cold and I had to slow down my pot intake since I was kinda getting the same deal going, although coughing up infected lung butter with a post nasal drip from hell wasn't helping and I had blew out my eardrum from trying to blow my nose and I ended up sneezing and coughing at the same time and I ended messing up my throat at the same time too. I threw up about an hour after blowing out my ear drum but that's to be expected when the equilibrium is thrown off like that. I'm just thinking that you probably are taking in too much air as well as smoke and your tummy's like "what the hell? I already don't feel good.. blahhhhh" Keep the burping up since that will let loose most of the pressure on your stomach. Other than that, maybe kick the expensive habit of cigarettes since they don't really do anything but cost you money and take it easy on the pot.