It permeated movies, TV and offices through the mid-80s. Look at some of the old movies and TV series pre-1986.
In the late 80s/early 90s the anti-smokers got more attention. Companies, for example, started having designated smoking areas. By the mid-90s, smoking was banned inside many office buildings.
Mad Men captured the sixties, with everyone puffing like crazy. Mom, smoking away, even let the toddlers play in those thin dry-cleaning bags without a thought of suffocation.