Mackenzie Phillips reveals she and Valerie Bertinelli drank wine and snorted coke on lunch breaks while filming "One Day at a Time" in the 1970s.
https://www.foxnews.com/entertainment/mackenzie-phillips-says-valerie-bertinelli-drank-wine-cocaine-sitcom-breaks
https://www.foxnews.com/entertainment/mackenzie-phillips-says-valerie-bertinelli-drank-wine-cocaine-sitcom-breaks