I've yet to get any nic hit from smoking a pipe.
I think it's a matter how pipe smoking and nicotine is completely different from, lets say, cigarettes. It's way more drawn out. I suppose we could compare pipe smoking to Oregon Trail speed nicotine delivery and cigarettes to a Shelby Cobra on the drag strip.
You are a lucky guy to have never felt nic-sick. It's horrible. Worse than being sick from drinking, although I don't know if you drink.