Again, looking for numbers is very difficult.
I'm a little alarmed to hear nicotine being demonized, because we're talking about individuals who have already been using nicotine for three decades, and they're not going to die from it. They're going to die from smoke. If they switch to an electronic cigarette, it's not the nicotine that's the issue unless their children swallow the cartridges, and then that's a different issue.