Does smoking stimulate brain functionality?

I've heard it said multiple times that smoking stimulates the brain. Could that be the reason why the fragile minds of Anti-Smokers are so easily persuaded into a theory so ridiculous as saying a little smoke in the air is some kind of make-believe health hazard deemed threatening enough to be regulated? Have Anti-smokers lost the logical functioning of their brain to the point that they can no longer make the obvious connection that more makes more impact and less makes less impact (thought that was simple common sense). Being that smokers tend to live as long as non-smokers; the assumption that their million times more exposure is somehow exempt from the laws of science and common sense in general seems completely retarded. Will the world get dumber as more people stop smoking?