As people much smarter and more articulate than me have pointed out, the best, most iconic SF isn't actually about predicting the future--it's about what was happening when the author wrote it, through a genre lens. So of course SF written even a little while back has lots of smoking.
Plus, there has to be something to ground most SF stories. Do you really want characters to be drinking pressed Zorbaxx juice and absorbing rehydrated Heebos root through skin patches while smelling each other's nano-drone-delivered pheremones, instead of them talking over coffee and sandwiches?