I'm not aware of any laws currently on the books under which an individual could be prosecuted for having "too much" nic, and the FDA's power to regulate is limited to things products that are offered in commerce. E.g.: Their regulations prohibit the sale of raw milk to consumers but if you have a cow, you can drink all the raw milk you want.
Can your children drink that raw milk? Time for state involvement, or so it sounds to me being a protector of all things children.