All Patients Should be Screened for Cannabis Use Before Surgery, First U.S. Guidelines Recommend

All patients undergoing procedures requiring anesthesia should be asked about cannabis use, according to guidelines released by the American Society of Regional Anesthesia and Pain Medicine (ASRA Pain Medicine). The first U.S. guidelines on cannabis use in relation to surgery also notes regular use may worsen pain and nausea after surgery and increase the need for opioids.