Evidence is beginning to mount that marijuana may cause lasting brain damage, even when used by people in their mid-20s. At a time when politics and culture appear to be increasingly pro-pot—two-thirds of Americans now support legalization—scientists have provided yet…

President Trump’s declaration that opioid abuse is a public health emergency is sparking debate about addiction. Tragically, myths and misinformation are blocking the path to preventing more deaths. Start with the causes of the opioid crisis. On Face the Nation, New Jersey…