This is why this study is so important; from Dr. Siegel's blog post on the subject:
"While two trials have been conducted in other countries, none have yet been reported in the U.S. However, we believe that the FDA will require research from the U.S. in the new product applications.
Three things make this study different from prior research conducted in other countries. First, we will be working with smokers who actually want to cut back or quit. Second, we will be testing the most up-to-date e-cigarette products on the market. Third, our study - if funded a the desired level - will involve the largest sample of smokers to date, making it the most rigorous and scientifically important study yet conducted."
Of course this study will not teach us what we don't already know. But the purpose of this study is not to prove anything to us - the purpose of this study is to provide sound scientific evidence that will prove what we know to those who don't believe it because "there's not enough evidence." We may have a lot of research on our side, but, as Dr. Siegel pointed out, there are no good quit-smoking studies with e-cigs that were done in the United States. Furthermore, the majority of quit-smoking studies were done with cigalikes, which we here know are less effective than second or third generation equipment. A study like this is absolutely necessary to support our position.
Also, Dr. Siegel pointed out later in his blog that he is seeking donations from people like us because he wants to keep the study free of funding from the tobacco or e-cig industries.
I think it's absolutely critical that as many of us donate to this study as we can.