Just checked this out - looks like you are ok to import flavor as long as flavor is in the correct solvent (pg is ok) and there are some other restrictions.
Check out para 22 of AVA food regulations:
"Flavouring agents
22.—(1) In these Regulations, “flavouring agent” means any wholesome substance that
when added or applied to food is capable of imparting taste or odour, or both, to a food.
(2) No person shall import, sell, advertise, manufacture, consign or deliver any natural or
synthetic flavouring essence or extract which is contained in a solvent other than a permitted
solvent, namely, benzyl alcohol, beta-cyclodextrin, diacetin, diethyl ether, ethyl acetate, ethyl
alcohol, glycerol, isopropyl alcohol, propylene glycol, triacetin and water..."