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[It's not something she has any sort of experience with - she only knows the things she's heard, but,]
It is, yes... given the connotations that a Host Club can have. There are a lot of serious issues that come from that industry in reality, most of which are self-inflicted health problems. [She only knows facts; but she's not going to spout off about people in a personal manner. That's just not her place.]
In any case, if it's not that sort of Host Club, there's really very little harm in it, I'd imagine. From what you're telling me, it doesn't sound as if they run at obscene hours or drink heavily.