The deductibles for catastrophic plans are really high, generally around $10,000. Not a good plan for things like cancer, most people won't be able to afford the treatments they need out of pocket before that insurance kicks in.
I think it's a bad idea in principle. If they are serious about forcing people to quit smoking just ban the sale of tobacco. We shouldn't feel entitled to place undue burdens on a group of people just because we dislike their behavior when it's completely legal.
Thats not really how catastrophic insurance works...
IF you have no insurance and you get cancer, the hospital gets you comfortable to die.
IF you have insurance they'll blow by the 10k so fast on their way to hit that insurance pot of gold before you get your first bill.
IF youre going to survive the cancer, making a 10k payment plan is the least of your worries.