The How of Cigarette Addiction

There is no doubt in my mind that there is something that we do not know about this affliction. In Michael Mann's The Insider I think they allude to studies about what makes cigarettes both harmful to one's health and addictive. Now there is no doubt of the chemical treatment of tobacco. But where and how does this happen? What do they do and what don't we know.

I have the solution. They make the smell stick. The tobacco is treated in a way that allows it to stain whatever it touches, and it is the smell that is addictive. It makes so much sense. Think about how cigarettes are smoked, with the mouth, which is immediately south of our noses. And if our noses are as sensitive as everyone says, what better place to begin the addiction. The smell is addictive. Now I am not sure how that is possible, but is it probable.

How hard would it be to make a smell addictive? Perhaps there is an irritant built into the smoke, which encourages a consistant supply of the stimulant. Like it requires to be fed. How hard would it be.