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Might cause a massive increase in smuggling and things that are sold as tobacco but aren't.

That would only mean you stop poor people smoking. Or, as has been said, force them to seek even more dangerous supplies.

When I used to smoke back in NI, I used to get cheap 50g packs of Golden Virginia from under the counter at a local off licence. I then learned that it wasn't just truck drivers bringing back duty free (as the obviously trustworthy off licence chap told me), but smuggled counterfeit shit that was funding local paramilitary groups. So I was unknowingly killing myself even faster AND putting money into the pockets of Johnny Adair and his mates.

I was even a hypocritical smoker in that I could never stand the smell of someone else's smoke. Cleaning the ashtrays out in the pubs I worked at was worse to me than cleaning the toilets (and if you've ever been in the Gents in the Commercial in Herne Hill, you'll know that's a bold statement).