Might have increased your circulation I guess. Could have also coincided with a diet change as well. I know, for instance, that cigarette smoke cuts down the circulation in your teeth, making them weaker and more prone to infection and decay. Of course, if you stop your teeth won't grow back, unless you're a shark.
If you're a shark and you smoke, hey man, I'm not here to judge you, but stop that. Sharks are underwater, first of all, so I'm pretty sure you're breaking a few scientific laws.