In addition to CP I have ulcerative colitis, which in my case is recurrent rather than constant. It is known that in folk with recurrent colitis, flare-ups are commoner in those who give up smoking. That happens in my case, and seems to be associated with nicotine. This doesn't happen in people who have never smoked- in other words, smoking does not help if you develop ulcerative colitis. Nobody is sure why this is the case, but it is a real phenomenon.
Now, the more often you have episodes of ulcerative colitis, the more likely you are to develop colonic cancer. ( I have biennial colonoscopies for this reason)
There is an association between smoking and worsening of CP, but I don't know whether this is caused by nicotine or all the other gubbins that comes in cigarette smoke, or whether it is simply a statistical association - people who smoke are more likely to drink, and so more likely to develop CP. or it might be a combination of the two.
So, do I continue to vape ( I use an electronic pipe) knowing that if I stop, my colitis could flare up, or stop vaping because it might be making my CP worse?
It is, if you'll pardon the language, a bit of a bugger.

Any suggestions would be welcome