Cotton candy is the same as EM
EM = Ethyl Maltol – Crystals to liquid - 1/4 tsp. to 10 ml warm PG or PGA (Some say VG will work)
Tiny Bit (A fraction of 1% in your mix) - Gives a "body" to the vapor and may slightly reduce sharp notes.
A Bit (Close to 1% +/- in your mix) - As above but will take the edge off sharp notes and may very slightly sweeten.
A Bunch (1%-5% of your total mix) - As above plus sweeten
A Load (10%+ of your total mix) - Cotton Candy flavor (EM info written by Hoosier)
Marshmallow flavoring is a great alternative (for adding moisture). I use it at a couple drops per 5ml, add that nice moisture feeling...
Marshmallow by The Perfumer's Apprentice is used like EM, for adding moistness and sweetness. (info from Master Mixers Tips and tricks)