This is possible. I was fairly certain that my issues were caused by aza because my indigestion began within a week of switching to a new source, and I began to get eczema on my fingers at the same time. I also had tension headaches every day untiI I stopped smoking cannabis from this source. I had very severe reflux as an infant, and I know that reflux can be caused by low stomach acid as well as high stomach acid. I also know that cannabis reduces bodily fluid secretions, including stomach acid. Perhaps long term use lowered my stomach acid level to the point that I had difficulty digesting food. I wish that cannabis were legal on the federal level so more research could be done on its effects.