Being somewhat of a nic-wimp, I tend to steer clear of blends that others have said have a strong nicotine presence. Given that body chemistry is a big part of it though, some of those might not have the same impact on me. Still, I want to enjoy my pipe; I do not enjoy feeling sick and puking.
There has been only one tobacco that I've smoked that has been a really heavy hitter in the nicotine department. If you can find a tin of Dunhill's Durbar give it a shot. It's one of the discontinued blends, so you might have to go to a brother who is willing to share, or find a tin on Ebay.
I loved the flavor of that blend. Very full, smoky, and enjoyable...except that after about a half bowl I had to put it down. I guess you could say it kicked my arse.
Mike