heres some viewpoints that are kind of on the subject, I couldn't really find anything that said adverts were a positive thing in any way, what do you think? personally i think these sites are going at the problem from the wrong direction, and that some of them need to get out more and stop worrying so much, but hey, all opinions are valid opinions and all information is valid information so here goes

http://www.ash.org.uk/html/conduct/html/tobexpld3.html
http://www.aber.ac.uk/media/Students/hzi9401.html
http://www.hda-online.org.uk/hdt/0102/nutrition.html
http://makeashorterlink.com/?H200126B5
http://www.eurocare.org/profiles/uk/ukadvertising.htm