> seem to be decades behind on reducing the prevalence of smoking and drinking,

the EU isn't a federal government. the UK, when it was in the EU did a full smoking inside ban, and tightened it after leaving.

It however had a massive problem with binge drinking and sorta didn't do much to stop that, apart from make it more expensive.

the netherlands has a smoking ban, but it was brought in later (I think). they had a different drinking culture so didn't have the same issues as the UK for drink.

That kind of issue is usually left to member states.

Packaging however is more the EU's purview