If no one is to blame for contact with a deadly virus, people who don't wear masks aren't to blame that they were in contact with it. People who didn't socially distance aren't to blame for coming into contact with it. People who went to big house parties and pool parties with hundreds of strangers aren't to blame. I kind of doubt that is what you meant to say.
Does smoking impact your respiratory system and make you more susceptible to covid which resides in the respiratory system? Yes. That's one example of a vice correlated with bad covid outcomes.