great site, Bev. The only active encouragement came from the tobacco companies (and those celebrities they had on their payrolls), but smoking was common on films and TV. The first anti-smoking campaign I recall was the entirely unofficial one run in Mad magazine, in which cigarette ads were spoofed; that was in the 1960s. Restrictions on ads were in force in the 1970s - you could advertise but not say anything very much. Benson & Hedges ads were very clever, just surreal pictures of packets and cigarettes that didn't say anything at all. There are a couple here:
http://www.hatads.org.uk/library8.htm#9
The real turning point was the evidence of the dangers of secondary smoking, which came out I think in the 1980s: that smokers weren't just killing themselves but non-smokers too. That gave non-smokers the leverage to demand that it be restricted.
London tube trains used to have 2 smoking carriages (seond from each end) until the King's Cross fire in 1987, and they stank; after that it was banned on the whole network.