Can You Tell Which Twin Is the Smoker by These Revealing Photos?

Before-and-after photos have their place and level of effectiveness for making points, but when you can compare how identical twins have aged - and use differences in smoking habits as the variable - one can hit scientific pay dirt.

http://www.theblaze.com/stories/2013/10/30/can-you-tell-which-twin-is-the-smoker-by-these-revealing-photos/