And exactly how many children have died from second-hand smoke??
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None, but kids with asthma can suffer, you can't legislate good parenting. Will the government get involved with parents who feed their kids McDonald's constantly, too? Answer: Yes. Any far-fetched nanny-state thing you can think of even in a comical way will come up for legislation.
I guess it all goes back to parents who think the whole world is their personal free daycare center.