This is pretty complicated, I think much more so than what you've said reflects.
First, if you can stop DO IT NOW. Any benefit you think you're getting is a rationalized illusion and the risks FAR outweigh any possible benefits. It is irrational, foolish, and truly dangerous to continue smoking, especially if you can stop. If you need to remind yourself of the downsides and risks of tobacco use google some images and read some first hand accounts. It is NOT a joke that tobacco KILLS. STOP playing Russian roulette if you can.
I smoked and/or chewed tobacco for most of my adult life and feel fortunate that I was able to quit a little over 10 years ago. It was not easy for me to quit. I had tried to quit many times over the years. I took a class about quitting and finally did. I hope for good.
I do believe that some people are more affected and/or addicted to nicotine than others. I had girlfriends that would smoke at the bar and nowhere else, which really pissed me off because I COULD NOT do that. BUT, there is no good understanding about this. Maybe these people are not far enough into the habit to be addicted. It seems unclear if some are really resistant to nicotine addiction and I have NO doubt that it is not worth trying to find out.
I'll stop here. But anyone can feel free to ask questions.
Cool, thanks. $5 -$6 / month is cheap.