Facial Changes Caused by Smoking: A Comparison between Smoker User mays85, in the e-cigs - Electronic Cigarette & Vaping subreddit, 03 Nov 2013
See if you can spot which twin was the smoker [xpost from r/science] User Cryogenicist, in the For things that are, you know, mildly interesting. subreddit, 03 Nov 2013
Facial Changes Caused by Smoking: A Comparison between Smoking and Nonsmoking Identical Twins User worldnewsbot, in the News From Around The World subreddit, 03 Nov 2013
Found this on /science today, thought it might help users here. Comparison of twins skin, smokers vs. non-smokers. User fromyourscreentomine, in the redditors helping redditors to quit smoking subreddit, 03 Nov 2013