According to Wikipedia, a national-level ban on smoking in transportation vehicles (planes, busses, etc.) was not enacted until 2007, although many states had such bans before then
"And the community forum shows people that they're not alone - people generally trust other people more than they trust the government." The cumulative effect of these policies is that smoking rates for adults have almost halved since 1980, says Henrietta Moore, of the Institute for Global Prosperity at University College, London, and are now at about 13%, compared to a global average of about 20%
Chan School of Public Health, previously explained to USA Today
When To Seek Help If youve tried quitting smoking multiple times without success, experience strong cravings, or smoke even when you dont want to, professional help can make the difference