Public health scientists Samet and Burke issue a strong warning in the current American Journal of Public Health about "the tobacco industry's attempt to discredit the scientific evidence on passive smoking, particularly the industry's use of the label 'junk science.' ... Unfortunately, 'junk science' has now become an ingrained pejorative. The public health community will need to be watchful in other arenas where the "junk science" gambit will be used. ... Trust Us We're Experts offer(s) a popular and cautionary account.... The lessons learned from this episode ... may prove most valuable for researchers who have not yet been labeled as 'junk scientists.' "