Primary source: American Thoracic Society
Source reference:
Lovasi GS, et al "Environmental tobacco smoke exposure in childhood
predicts early emphysema in adulthood: The MESA lung study" Am J Respir
Crit Care Med 2009; 179: Abstract 3965.
Where is the URL? You have failed to provide a URL.
Follow the article if you can. Oh, and I've asked you and Scotty several
times, please post peer reviewed articles that state that second hand
smoke is not harmful to those who inhale it.