I've read of the advantages or selegiline in this regard, but not nicotine. The information I have come across regarding benefits are to it's neuroprotective actions and cognitive benefits.Thought about them (a little) but they are not exactly for the average jo!
Was reading something earlier that looked potentially very intriguing but haven't had time to delve into it (and quite possibly debunk it) : [nicotine / smoking use causes] "the upregulation of three main internal anitoxidant & detox enzymes -- glutathione, catalase and SOD", plus anti-inflammatory action, giving rise to a ~20% life extention (if can avoid the cancer of other complication. For what it's worth, link : Nicotine Experiment - ImmInst.org Forums
Would certainly be great if it were possible to achieve these things without the dangers.
I have quit numerous times, for two years at one point, and the entire time I felt like a ...... Even after two years, the best way I can describe it, I was 'close minded'. Unable to think laterally, lack of creativity, lack of empathy and/or able to see other points of view. Those two years cost me in many ways.
As for benefits, whether they actually exist or not, one thing is very clear to me.
The sustained high levels of cortisol from the anxiety and stress of not smoking, and/or smoking but being vilified by society for it, is extremely detrimental to ones health, both physical and mental (which amount to the same thing when you look at hippocampal neuron death).
http://www.jneurosci.org/cgi/reprint/19/6/2356.pdf
While necessary and beneficial in short small doses, nothing is more caustic than cortisol and it's associated metabolites over the long term.
One study I read about cigarette vs pipe smoking actually made the link to 'relaxation', and compared the meditative ritual of pipe smoking vs the frenetic 'quick smoke' of cigarette smokers.
All off topic, but interesting. When I think benefits, I ask myself would I start my kids on smoking? obviously not, but then ask myself 'why not'? how much is fact and how much is propaganda.