You may build up some more tolerance to nicotine over time, but most important are the receptors you were born with. I like a buzz now and then, but I don't smoke for that, and not smoking does not induce cravings. Luckily for those who are sensitive, many blends are mild and will not bother most sensitive people. Our sponsor tobacco retailers have ratings that give the "strength" level to guide you on that. Also, having a substantial meal and being well hydrated will fend off ill effects up to a point. If you get queasy, lightheaded, or groggy after smoking a blend, that might be one to avoid or cut with milder blends. Cigars are often more effective nicotine delivery systems than pipes, so be cautious (even more cautious) with them and heed the strength ratings.