RedTracker| In a study of staggering importance, a Tel Aviv University researcher has confirmed that young men 18 to 21 who smoke are likely to have lowers IQs than their non-smoking peers. Following more than 20,000 men before, during, and after military service which is mandatory in Israel, results confirmed that the average IQ for a non-smoker was about 101, while smokers had an average of about 94.
The IQs of young men who smoked more than a pack a day were lower still, at about 90. An IQ score in a healthy population of such young men, with no mental disorders, falls within the range of 84 to 116. The results were consistent over socio-economic groups. via Science Daily