still with us or the cfo of the tobacco vapor electronic cigarette association, stanton glans, center for tobacco control use, and the vice president for research for the campaign for tobacco-free kids. so have there been studies, doctor? >> there has only been one study so far, and that showed that they irritate the lungs. the problem is in order to really assess the health effects of these products, it's going to take five or ten years of watching people using them and see what kind of diseases they develop. the real issue is what is called dual use. 50 to 90% of the people who use these cigarettes continue to smoke conventional cigarettes at the same time. so as long as you are smoking any conventional cigarettes, you are suffering the full heart disease risks associated with smoking, and they are just cutting down the number of cigarettes that you are smoking probably doesn't give any more tallty benefit at all. >> i wanted to get tom back in here. dr. stanton glance brought up concerns about other chemicals and things you really don't want in your body that are in these e-cigaret