According to a newly presented study conducted by Harvard researchers, people who began smoking marijuana before the age of 16 score significantly lower on a standard test of intelligence than those who began smoking after 16. What does this study mean? Maybe the earlier onset smokers were more likely to be stoned while they were evaluated. In any case, check out the data yourself here at WebMD.
Did you smoke in your younger days? Let us know whether you think it made you dumber by commenting below.