As Hilary noted earlier, the evidence is not clear on whether or not these products assist folks to quit smoking. There has only been one randomized control trial done by Bullen and that indicated that the quit rates were similar to other nicotine replacement products. There are a number of other studies ongoing that have mixed reviews around the ability of these products to help folks quit smoking.
I think the second piece of information that's interesting to look at is whether or not the products create dual use within smokers, as opposed to helping folks quit, that folks continue to smoke a regular tobacco product and then use e-cigarettes as a secondary mechanism. What we do know is that quitting tobacco outright has a much better overall impact on your health than continuing to smoke even some products in the long term. But the bottom line is that we do not have the evidence yet to demonstrate that these products definitively help folks quit smoking.