I've read about supposed benefits of nicotine a while ago and got myself an electronic cigarette. I have never smoked before.
Not sure if there are any mental benefits. I feel a bit more relaxed right after vaping. No ill effects whatsoever. I made a few week to month long breaks to see if there would be any addiction - there was none. I was able to stop at any time.
It's sort of like snacking for me, but without the calories. Definitely contributed to my weight loss.