This is crazy but my blood pressure has been a big problem for 2 years and i do smoke and also use dipping tobacco while at work. They say that blood pressure is a silent killer with no symptoms but i disagree. I can tell when my blood pressure jumps. Well last night it jumped and it was right after i smoked a cigarette. it went up to like 185/110 so i stopped smoking for like 12 hours and it was like 118/82. Well today i didn't smoke but i was using dipping tobacco and checked my pressure and it was like 145/100 is it possible that im allergic to nicotine and it causing this?