Does or will humanity's bad habits open up for viruses in the long run?
Like think of mankind as an individual and if over 50% of that indivudual
does unhealthy things like smoking (whatever the product), drinking etc. But over a course of "many" years, could a virus or bacteria adapt to bad human habits?

Like the hypothetical virus I'm talking about didn't exist until humans
fucked up their lungs enough, because it wasn't "ready". What is a virus before it becomes a virus? Sorry for bad english, I never post on /sci/, just had an random stoned/drunk thought.