But a child that young probably wouldn't ENJOY smoking... It's all well and good saying "but niccotine is addictive blah-di-blah" but children of that age have far larger taste buds and far smaller, softer lungs! Most children of that age can't stand passive cig smoke let along breathing it at the age of 2 voluntarly, the tyke would probably throw up and, being learning creatures, avoid cigarettes ever afterwards! One of the most addictive aspects of smoking is not the drug itself but the action involved; the art of the process... and that's something I doubt a 2 year old could grasp.
If this is true, however, the answer is simple: Shoot the father in the face and claim the child. Give the Tyke to a proper family.