are e cigarettes unsafe? SiOWfa15: Science in Our World: Certainty and Controversy E cigarettes Impact Brain Blood Flow, Increasing Stroke Risk Understanding Vaping Headaches: Causes and Solutions Vape King Blog Is Iqos Less Harmful Than Cigarettes Perceived relative harm of heated tobacco products (IQOS), e cigarettes, Note the SWITCHEROO tactic. First they lie by saying it's a "myth" that e cigarettes are LESS HARMFUL THAN SMOKING during pregnancy (recent studies found #vaping IS less harmful than smoking during pregnancy.)