A letter in today’s Irish Times, co-signed by more than 20 doctors, is raising concerns about the use of cannabis among young people. They say their previous efforts have been ignored, and they want a comprehensive public health campaign around the hazards of using cannabis.

Sean was joined by Dr Brendan O'Shea, one of the signatories, a family Doctor in Kildare and an Assistant Professor for Public Health and Primary Care at Trinity College…