Hi Nosebag. Smoking isn't an effective way to treat crohn's. You'd get much more benefit from ingesting cannabis.
For stricture I use hydrocortisone enema every night for some time. Additionally, I use mesalazine enema and salofalk granules every morning.
Maybe sulfasalazine can help you. Pentasa isn't effective for colonic crohn's.
If I were you, I'd add sulfasalazine or asacol, mesalazine enema to my daily regimen. They are really the least toxic drugs for crohn's. I would also add hydrocortisone enema; but I don't know where is your crohn's stricture located. If it is on your left colon, sigmoid colon, rectum... than rectal meds can help greatly. If it isn't, then they wouldn't help. Hydrocortisone enema does have much less systemic effect than prednisone tablets. I would also make my own cannabutter and take it daily. These can help you.
As for Anti-Map therapy, most doctors can't use clofazimine because it is not available; but I've read that it is the most important antibiotic among the other anti map antibiotics. It is needed to achieve a greater success.