The study discovered that average IQ of a non-smoker was about 101, while smoker’s average was about 94. The IQ of a smoker who can smoke more than a packet in a day lie around 90.

The study directed by Prof. Mark Weiser of Tel Aviv University’s Department of Psychiatry and the Sheba Medical Center on 18 to 21 yrs old men working in the Israeli army.

This study also tracked two twin brothers, in this case one of the twin smoked and he registered lower IQ on average than the non-smoker twin.

Researchers took data from more than 20,000 men, some of them had left army, some of them are in army and some of them are planning to join army. During this investigation it was found that all men acquire good health, since they had to keep their health according to the norms of army. Researchers found few surprising results, 28 percent are sample smokers smoking one or more cigarettesin a day, 3 percent are ex-smokers and 68 percent are non-smokers.

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