Look up ulcerative colitis for starters...It's what he said next that shocked me.
According to him (only as I have found nothing backing him online..... not surprised as big pharma could have a hand in it), nicotine may actually suppress some illnesses. He want on to say that some illnesses being suppressed by nicotine will/may flair up after one quits nicotine for so long, and after they present, nicotine will no longer work in suppressing them.