January 10, 2012 5:24 pm Effect of Pot Smoking on Lungs Dr. Bruce Hensel looks at a study that tested the effect of pot smoking on lungs. US & World Videos 1:12 5 things to know about Tom Thibodeau 2:42 Police find tents of missing Australian brothers, San Diego man surfing in Mexico 21:18 Jim Gaffigan gives hilarious dad advice to Kelly Clarkson audience 9:45 Orlando Bloom says he's shocked he's still alive after filming his new adventure show 2:13 Ryan Gosling talks Emily Blunt's ‘next level' fight scene in ‘The Fall Guy'