Nicotine in its natural form is said to:

-Increase Hemoglobin and raise immunological defences.

-Speed up metabolism, thus allowing greater food intake.

-IMPROVE test scores in IQ test. Caffeine, one of the other
substances tested, was not useful in this respect nor were many of
the things traditionally thought to "boost" brain performance.

-Excite neurotransmitters. You require less sleep.

-Settles stomach. It also stimulates the digestive tract.

From my experience organic and additive-free cigarettes do not cause
shortness of breath or breathing difficulties.

Have you noticed that most Energy Healers and Psychics are smokers?
Some even say it increases their abilities. After all it was widely
used by Medicine Men, wasn't it?

P.S:I do not garantee this is the Secret of Eternal Youth though! ;-)