If I respond to that first, I think something very similar.... It's difficult, because as I've already argued, I would prefer that teenagers experimented with electronic cigarettes than real cigarettes. At the same time, I think we have to have restrictions on sales below the age of 18. In England there is a law coming through to deal with that.
So far, however, it has to be said that, with the exception of the Polish data that Dr. Peruga referred to, which also showed a 60% increase in smoking in a three-year period—rather larger than I could believe, because the samples were not taken from the same sources on the separate occasions—the availability of electronic cigarettes hasn't led to a huge increase in use among young people who are not smokers.
So it makes sense to have restrictions in place, but I wonder if they're necessary.