"The faces of people who smoke may age in a less attractive manner than those who do not". Well, possibly, but it doesn't show that it is BECAUSE they smoke, unless they've controlled for a whole load of other things. (I'll betcha those smokers booze more too, for a start.).
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Bloody hell. I just had a look to see whether they did control for anything else. (No, they didn't.) But I wasn't expecting to find that they only used THREE sets of male twins. I can't believe their cheek in even publishing that!
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