Julie8008 excellent post at 1939.
I know it's not evidence but I personally notice on many American tv shows and films characters drinking and then driving, unless its key to the storyline it seems to be seen as no big deal - can American posters comment re social acceptability of this?
I live in Scotland where the drink drive "limit" is now effectively zero since December 2014 and it's made a huge difference.
I'm also not sure on rules on smoking in USA but again in uk/Scotland you can't smoke in public buildings. In some cases not even on the grounds (eg hospitals). You can't even buy cigarettes until age 18. Tons of other rules too around smoking.
As the child of an abusive alcoholic I've noticed big differences in how people treat that issue too. In the 70's it was seen as private family business, now people are far more likely to report/intervene.
Driving generally - in USA youngest age is 14.5, but generally it's around 16 yes? Here in uk they can't even start lessons until 17, there's 3 elements to the driving test - hazard awareness, theory, practical - all of which have to be passed before they get their full licence. The cost, time and difficulty of passing the driving test means most youngsters don't get their full licence until around age 18. In addition the cost of buying and running a car is high here (especially insurance) which means even once they pass their test quite a few cant afford to get a car anyway. It's not like it seems in USA where high school kids are driving to school with a gaggle of friends distracting them. If new drivers DO drive in careless/dangerous ways they can quite easily end up losing their licence.
USA as a whole (not saying all Americans) do seem to have strangely lax approaches to potentially dangerous activities generally, the gun issue is the most extreme example.