he's the co-author of the case study on e cigaretteses. crystal, i'll start with you. they propose to ban sales to minors and free samples and to not allow vending machine sales in venues open to minors, and they also have, of course, that mandated ingredient disclosure. but they can advertise and add flavors that are appeals to kids. do you think these regulations are going far enough? >> i think it's a good start. i think that the fda is really uncharacteristically kind of going very carefully here. obviously, we don't want to be distributing our marketing drugs that affect the brain to adolescents whose brains are still developing, so i think banning sales to those under the age of 18 is a really good start. you can look at some of the marketing and advertising practices as a second step, but good. >> john, what took so long? these devices do deliver nicotine, as crystal said, and it's addictive? >> well, as crystal pointed out, there are still uncertainties regarding the impact of nicotine and nicotine addiction. i think most people think it's a bad idea, but the t