I gave up smoking 2 and a half years ago. I was officially diagnosed with IBS about a year ago (with symptoms occurring for years before that). Anyway, having thought about this, my IBS was more D based when I smoked. Since stopping, my IBS is now C based. I'm not saying that stopping smoking has made me constipated by any means, but it's just an interesting observation ESPECIALLY as i quite often have to smoke a shisha/hookah pipe to instigate a BM - and 95% of the time after smoking the pipe, i have a very successful BM. Is tabacco/flavoured mollasses a type of laxative? I do recall in my cigarrette smoking days that i would very often have a BM in the morning after my morning smoke...