Over the past few decades, scientists have been trying to uncover whether or not cannabis harms long-term brain health. Much of the research thus far has been focused on the adolescent use and IQ in adulthood. Yet, it has been difficult to nail down many firm impacts. Now, a small study published in Frontiers in Pharmacology conducted by Harvard University, Tufts University, and McLean Hospital, has found that cannabis seems to improve cognition. Read more here.