What makes it so easy to be addicted to cigarette smoking?

Nicotine is powerful. As powerful as heroine in promoting dependence, and some of us are wired so that we are more likely to become addicted after just a couple cigs. Add to this the cumulative 70 year sceintific effort of the tobacco industry to create the perfect addicting product, and the individual stands little chance once they light up. This is especially true of teens, at whom most tobacco ads are aimed.