TL; DR. Only oral administration. At least 3 weeks between uses. IQ tests are too narrow to assess the real picture. Can't believe these are still in use. And

TL; DR. Only oral administration. At least 3 weeks between uses. IQ tests are too narrow to assess the real picture. Can't believe these are still in use. And what I think researchers should really test is level of "will power" i.e. self-control. Once a week is indeed too frequent. You have to take longer breaks. If used recreationally at least 3 weeks between single uses, and once, or better twice, a year a 6-8 weeks break. Plus, never smoke it, only eat. Smoking is the most addictive way of administration. Also, the title is misleading indeed. What marijuana does is sort of "conserving" your brain, not damaging it. It's absolutely the opposite. It's like neural back pressure.