Pure Liquid Nicotine - It's Healthy and Good for You Propylene Glycol is preferred over Vegetable Glycerin for a good throat hit. It produces less smoke as compared to the VG however. Nicotine is diluted with propylene glycol liquid in a GMP facility to ensure very high purity products and packed in food-grade containers. Contact BGP Europe AG today! in Public bookmarkswith propylene--glycol-e-liquidby 9 users