Pixiv commenters inform me that CHERRY is a brand of tobacco which has gone out of sale. I guess that'd be why Rinnosuke's now selling it.

I'm tempted to add this to the "nostalgia" pool, pretty sure that's how most of the first smoking attempts went down. "Hey, it just won't burn!"

Well, this explains why Shizuha always seems to be smoking in Onikobe Rin's comics. I had been wondering.