NICOVENTURES CLINICAL TRIAL ON INHALED MENTHOL NICOTINE. “A pressurized canister that contains a formulation of pharmaceutical grade (free-base) nicotine formulated with propylene glycol, ethanol, saccharin, menthol, and HFA134a (CFC free) propellant.” A randomized, open label crossover study of 18 subjects. Historic.
http://ntr.oxfordjournals.org/content/early/2014/11/27/ntr.ntu228.full