According to an article from Medical-News.net, "University of Queensland researchers have confirmed a link between depression and stomach ulcers, in the world's largest study of genetic factors in peptic ulcer disease." Also, high stress, anxiety disorders, PTSD, etc, are common causes for a compromised immune system and a prevalence of stomach acid
An elimination diet is where a person would cut out all known gas-causing foods before introducing them back in, one at a time, to find out which ones cause the symptoms
More than 7 million of those deaths are the result of direct tobacco use
Its becoming difficult for everyone.
Also, it is worth noting that hemp cigarettes may emit a smell similar to cannabis products that contain high levels of THC