Just dont blow vapor directly on them. A lot of people are like yeah i do it around my cats no problem blah blah, well me too, same experience, but i still keep the vapor away from my cat as much as possible.
I swear i once read a thread about a guy that was ALWAYS blowing his clouds at his cat, and it ended up dying from it, maybe its bad memory or it was bogus. Thats why i initially have kept and am keeping the clouds away from my cat. I tried to find it but no luck =(