Just make sure that the paper around the tobacco doesn't have any chemicals in it. Then your cigarettes won't be addicting. It's the chemicals placed in the paper by the tobacco companies that is addicting. The tobacco, itself, is not habit forming. In fact, the nicotine is good for you - The Other "N" Word.
Nicotine extract at high enough concentrations have potential to harm as does to much of anything. Burning paper for the smoke isn't required as many cigars are rolled in the tobacco leaf. How did Val Kilmer get throat cancer?