I too live up in the PNW, but my climate may be more dry than yours. Especially in the summer.

Either way, I have not experienced this exact phenomenon. As already mentioned, cigars in general actually deter bugs. I make a bug killer/repellent for my plants out of dish soap and cigar ash. Works very well.

I have oddly enough noticed that paper wasps seem to be attracted to cigars though...Don't know what that is all about.