THIS IS NOT A LAW!!!
It is, instead, a regulation. A "law" is something voted into effect by representatives that are accountable to constitutents. A "regulation", which is what this really is, is created by a bureacrat that you will never meet, probably will never even know the name of, and has substantial power to screw up your life with impunity.
I know in Delaware, Maryland, Virginia, Florida, and a host of other states, the legislatures enacted the laws that make it illegal to sell tobacco products, or even matches or cigarette lighters, to anyone under 18.