All E Cigarettes Emit Harmful Chemicals, but Some Emit More Than Others Berkeley Lab Berkeley Lab News Center PG (Propylene Glycol) E Liquid Base Make My Vape Comparative study of lung toxicity of E cigarette ingredients to investigate E cigarette or vaping product associated lung injury ScienceDirect We break down the key differences between traditional cigarettes and e cigarettescovering: 1 Their compositions and ingredients. 2 The health risks associated with both. 3 Nicotine levels and addiction potential. 4 The impact E cigarette aerosols of propylene glycol impair BK channel activity and parameters of mucociliary function American Journal of Physiology Lung Cellular and Molecular Physiology American Physiological Society