Trivia: One-Pack-a-Day Smoking Habit = 2 Teeth/10 Years

One-pack-a-day smoking habit will cost you at least 2 teeth every 10 years.

According to 30-year studies at Tufts University, chain smokers lost an average of 2.9 teeth after 10 years of smoking one pack a day. Non-smokers lost an average of 1.3 teeth after 10 years. A smoker that quit will reduce his or her toothloss to 1.7 teeth. (Source)

that's exactly what i was going to say! not only that, but when you quit smoking, you tend to adopt more healthy practices, which may include brushing your teeth more often than when you smoked.
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agreeing with #4.

did they study the dental records of these people before they started smoking? perhaps they had 10-12 cavities before they started smoking.

i can't stand this new sensationalistic reporting of scientific studies/research/whatever. focusing on a small amount of the data always means you're going to see some sort of pattern that doesn't jibe with the bigger picture.
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Mooncake is spot on. Studies like this are rife with cross-correlation problems that make assigning causality impossible.

People who smoke are going to be less healthy-living oriented in general. Ergo, it makes sense that they probably (in aggregate) brush & floss less, visit the dentist less, and consume more sugary food & drinks. Those things are all known to correlate with increased tooth loss, so it's probable THEY are the problems and not smoking itself. You could also probably extend the study and find that smokers tend to drink more alcohol as well and vice-versa. So what causes what? I'm not a fan of smoking, but its most zealous opponents only make themselves out to be kooks/biased/idiots when they publish such fundamentally flawed "research". Were there really PhDs involved in this??
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Chain smokers? One pack a day? Any chain smoker worth the name could get through a pack in an hour. Heh heh, militant non-smokers seem to think if they smell smoke twice a day that's chain smoking.
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I smoked about a pack a day for about ten years, and quit a little over a year ago. I didn't lose any teeth. And my husband who quit smoking like four years ago and never smoked nearly as much or as frequently as I did has lost two teeth.

But I think there's a lot more to it than just smoking. There could be other factors. Like stress levels of smokers versus non-smokers? Or diets? Or dental care coverage? When I worked in the restaurant industry, most of the people I worked with were smokers, and most were also uninsured. I could see how having dental insurance could help you keep your teeth longer.
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I am NOT a smoker, nor ever have been. I hate smoking and being around smoke. That said, I also hate the credence given by the press to bullshit studies even more... If you wish to advance an agenda (and don't we all?), it only *hurts* your case to attempt to do so via flawed arguments. It's tougher to design a study that attempts to isolate the varied factors and eliminate (or at least minimize) cross-correlation, but it's not impossible. 'Tis only an incompetent / lazy / biased (choose one) academician who would have designed so flawed a study.

Also see my critique on the study that "shows that kids lose weight by eating breakfast". More fodder.
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