Well, Frog, the study Rip refers to didn't say the heavy weed whackers got dumber...just that they were more likely to develop schitozophrenia (spelling?). Your study also notes a slight long-term damaging effect on learning and memory, and further notes that no scientific studies support the "ancedotal" evidence of the medical use of marijauna. So, the conclusion is that it's proven to be potentially harmful, and to have no measurable benefit. I.e. it should remain illegal. Thanks for your support.
Sabre