“Cannabis (or marijuana) has been used in traditional medicine to treat intestinal inflammation. A survey by Ravikoff Allegretti et al. at a specialized IBD clinic shows that, in the USA, marijuana is used by a substantial number of patients with IBD to alleviate their symptoms.”

http://www.nature.com/nrgastro/journal/vaop/ncurrent/full/nrgastro.2013.245.html