I have been smoking for 3 years (28 now),average 4-5 joints per day(no bong,vaporizing).I have red all posts about marihuana and stomach problems in this thread and many other sites,anyway people here were describing different symptoms and their health condition ,i analysed all and compare to my symptoms.Anyway considering symptoms i have:mild spasm,mild pain in whole stomach area,just a little nausea and urge to vomit(very little),all these symptoms happen after joint,vaporizing(last few weeks tried with that),bong(last few weeks tried that also).Mostly symptoms stop in 1-2 hours during which i burp and fart and gas release makes me feel much better.During the day situation is almost normal,just slight spasm after eating(just sometimes) or when i sit or lie down on bed in awkward position .I got conclusion my problem is gastroparesis,and i supose its acute BUT during the time it can become chronic.My opinion is that 90% posts(people) here have same problem with lower or higher symptoms,problems rate.Read about gastroparesis and i think you will found some solutions to ur problems.Unfortunately all of us will have to quit MJ for some time or maybe,just maybe even permanently:(.Read about gastroparesis and i believe u will find answers to ur problems.