These characters are always so frickin' coot. Kanda's such a tomboy she doesn't even know how a normal girl is supposed to think. You think she would have found out much sooner if she knew her first name was Mizuki. I guess she still doesn't know her first name yet. Either she never told her out of the cliche of being embarrassed by referring to each other by first names or she figured it would reveal her gender.
Every time I see or read about someone smoking in fiction and it's intended to come off as suave and cool I can't stop thinking about how disgusting it is to be anywhere near someone who is smoking IRL. Kanda probably tastes like an ashtray.