text_1: The best evidence is that you lose -- if you use marijuana as a teenager regularly -- eight IQ points.
text_2: Marcus said the best evidence shows that teenagers who start smoking marijuana will lose eight IQ points. This overstates the actual underlying report. It would be more accurate to say the study showed a higher risk of losing that many points on an IQ test, not that a person necessarily would. More fundamentally, an equally reputable analysis found that IQ loss could be tied to household incomes as much as marijuana use. Clearly, a scientific consensus has yet to emerge, and Marcus ignored the ongoing debate.