Actually, I am not sure smoking does make Crohn's worse. It might, but there does not seem to be any clear studies proving this that I am aware of. I have heard that it can make Crohn's appear higher in the intestinal tract.
Some think the stress relieving effect may be useful. Of course all of the other health risks probably make it a bad enough idea on there own merits.
I am pretty sure chewing tobacco is not going to help, but I think that will become apparent if you try it.
I quit smoking right in the middle of my flare and stricture problems, prior to diagnosis. The only result was my pain level went up a couple of notches over night. When I started again, it did not improve.
Dan