I think i have a similar problem,i have found that it is due to the green. It doesnt seem to be anything bad,but i get really gassy and it is almost like indigestion. Soetimes i get the cramps like he has described but it seems to be just gas. I suggest trying GasX and a Prilosec OTC,i have been doing the Prilosec for the last couple months off and on and Gas X when needed and havent had the problem in a while also i found that it happened when it was warmer than usual and when i was stressed alot. Dunno but that all worked for me well. Hope it helps you

Oh i also smoke everyday starting in the morning and pretty much throughout the day unless im on prescription pain killers (i dont mix my meds). Been doin it for a few years.