These 20 signs mean you’re probably smarter than average

You don’t smoke

In 2010, Israeli researchers compared the IQs of 20,000 young men. They noticed that men between 18 and 21 who were non-smokers had a slightly higher IQ (101) than smokers (94). In addition, heavy smokers—those who smoke more than a pack a day—had an average IQ of 90. Just one more reason to quit for good!

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