I've had Crohns for 22 years. I have used cannabis on and off for 35 years. When I was first diagnosed I had just started a family and got all responsible and only used cannabis occasionally, perhaps every couple of months or so. When diagnosed I was very ill and spent 2 months in hospital. The doctors did a great job and got me better without surgery and I then went on to live a pretty normal life and only suffered occasional flare ups although I had diarrheoa almost every day sometimes about 6 or 7 times a day. Despite this I considered myself lucky and was able to lead a healthy active life with not too much difficulty.
About 4 years ago I became interested in using cannabis medically and started experimenting. I now use approximately 0.15g per day, most days. I grow my own tiny supply and I almost always vape. My bowels now behave almost normally. I only occasionally get diarrheoa. Every 5 years I get a colonoscopy where the doctor has a good look inside and I get to see it all on a widescreen tv. I had the last one about a month ago and the doctor was amazed to find only scarring visible, the inflammation and ulceration having almost completely disappeared. He asked me repeatedly what my symptoms were and seemed surprised to hear that they had almost gone completely. He asked me what I was taking and I told him "beneficial traditional herbs" because I live in an illegal country.
I don't know if the cannabis is helping my Crohns or not but my gut feeling, excuse the pun, is that it is helping me. I think that there needs to be much more research done in this area, people deserve to know the truth. In the meantime I will continue using cannabis as I feel that the benefits outweigh the risk.