I think information and culture/fashion both have a lot to do with it.
Pre-social media, you could get drunk and embarrass yourself, and forget about it by the next day. Now everything is recorded. Information about alcoholism is easier to come by, and there are influencers like worldoftshirts who show people what life as an alcoholic is like. I don't see how anyone could want a drink after watching content like that. Smoking weed in front of a camera doesn't seem as edgy as it used to now that it's legal. Having red eyes in a photo is annoying. Vaping has always had a cringe factor.
All of this tech is giving us the ability to look in the mirror and see what we're doing to ourselves.
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