I have UC, and have been battling it for 3 years now. I think that the only way vaping has helped is that it has kept me mellowed out, and I don't stress out. I have been using three different medications for three years, and my Dr. I think is going to be making a switch soon, so I will see what will be happening there.
If it came to me possibly having to use a pouch, I might consider going back to smoking. I'm saying that, not really knowing what all is involved in that. I haven't done any research on using the pouch as I don't really want to think about it. I guess that the pouch is the last resort tho. I'm assuming that using the pouch lets you get on with life a little better? Others have a much more severe case than I've got.
You might want to check this thread:
New to WTA | E-Cigarette Forum
Also there are a couple of old threads in the Health forum somewhere if you can dig them up for some reading.
Good luck, and feel free to pop back in this thread, or any of the others.