> Lots of people smoke pot. They do so, presumably, because it affects their brains, and not despite that fact. It would be astonishing and inexplicable to find

> Lots of people smoke pot. They do so, presumably, because it affects their brains, and not despite that fact. It would be astonishing and inexplicable to find that getting high didn't bring about changes in the brain. But are those changes lasting? Are they permanent? We don't know and we'd like to know. The study didn't even find that the brains had changed at all, just that they were different. As the sample was so small, they could just have well concluded that brown hair made a difference or people who prefer broccoli to cheese are more likely to smoke pot.