Auntie Betty's Flying Club didn't like smoking while flying - hence the Shack Mk 3s, when delivered, had their ashtrays removed. Most of us smoked (unofficially) and the standard ashtray was a paper cup half-full of water. One of our (then) AQMs on the Bev was a forty-a-day man and the climb to the flight deck would generate an interesting facial shade of blue!! This relates to the world of medium range transport - don't know what the 'shiny fleets' used to do!!