I remember this. Ashtrays were practically part of the furniture (especially coffee tables), even if you didn't have a smoker at home.
If dad didn't smoke, surely he had guests who did.
And in the late 90s, being on a plane and the chairs had a metal folding door on the armrest that exposed an ash tray. Smoking on planes was already gone or going away, but the hardware lingered for quite some time.