I agree with the OP inasmuch as Nicotine gets the blame for everything bad about Cigarettes...Its not the Nicotine that makes for the Yellow fingers, stained walls, stinky smell, its the smoke, and people who for years cook in smokey huts and kitchens
tend to get lung problems. I do think Nic is addictive, but I suspect the whole leaf we smoke in Cigs is more addictive than the extract in our Vaporisers.
Actually all the Nightshades contain Alkaloids, Tobacco leaf being the highest, then Eggplant, Tomato ect, in lesser amounts than Tobacco. Nicotine apparently stimulates the receptors in the Brain, and gives a temporary surge of energy, but eventually with years of use overstimulates and the user ends up with jangled nerves,
This article does a good job of explaining it all-( Cortez did the World no favours when he introduced these plants, lol )
Nightshade Foods « OrganicFoodee.com