yes, but not all food flavorings are suitable for adding to eliquid. For instance, i have heard that some oil extract type flavorings are problematic so i don't use them. safest to stick to brand name flavorings like TPA, Capellas, FA, LA etc
as mentioned by the other poster, nic content will be reduced a bit as well as VG content unless you get VG based flavorings, which are less commonly found.