I think it's also partially due to smoking being more and more considered disgusting, not just inconvenient. The peer pressure of "don't do this very stinky disgusting thing around me" must have at least a little to do with declining smoking rates. Back in the 80s, most people didn't have the guts to say "Hey, don't smoke around me, it's gross!" but plenty of people do today.

We need to culturally consider Social Media use to be disgusting or at least something to be ashamed of.