I prefer 62-65% for smoking. When I age I do a strict 65%, but I'm considering bumping it up to 68% when I get my cabinet set up.
I think that burn, draw, and flavors all increase immensely when you lower your humidity. That and smoking a stick at 70+%RH in Colorado is about the same as putting a stick of dynamite in your mouth and lighting the fuse.
TYLER