Fine note: Mint is not a stimulant. It's technically not a sedative/depressant either, but it tends to calm people down and so works like one. (Mint has a number of alcohols, but nothing that typically affects humans.) I would say a +2 to Wisdom checks (rather than Dexterity) would be more appropriate. I would also apply the bonus to Wisdom checks, rather than the Wisdom score itself, so that it doesn't affect spellcasting.

I also approve of any new item that throws oozes. Too bad there isn't a spell named "Otto's Irresistible Get Down And Jam" to go with the theme.