Smoking is a very good stress reliever as well as being good for helping you think straight, I know it helped me when I was in a stressful situation to light up then suddenly everything was in line and I could think about what to do in an instant.
That's not actually how it works. The first time you smoke a cigarette it doesn't have those effects. It's not like marijuana or xanax, it doesn't interact with the GABA producers or receptors in a way that will relieve stress. However what does happen is that over time a neurological addiction occurs and the brain becomes stressed when the person doesn't smoke. Then when they have a cigarette they go back to feeling normal. It feels like stress relief because you are coming down from an artificially stressed state. But in reality all a smoker feels when they smoke is how non-smokers feel
all the time.
So a non-smoker will knock it as they actually do know how it feels. It feels like every moment of every day. But for the smoker they only get that feeling of normality when they smoke, the rest of the time they are operating under increased stress.
Imo, it's just about the stupidest drug in the history of drugs. You pay money to change your brain chemistry to make you feel crap unless you are on the drug and then you feel the way that you started out. It's mind boggling. At least with marijuana, MDMA, LSD and even the more destructive drugs like heroin, meth and alcohol there is an immediate mind altering effect that the user experiences right from the first time they imbibe.