formaldehyde in cigarettes effects Chemicals and Tobacco: What's Burning? The Effects of Smoking You

The FDA concluded that the carbon monoxide exposure from IQOS aerosol is comparable to environmental exposure, and levels of acrolein and formaldehyde are 89% to 95% and 66% to 91% lower than from combustible cigarettes, respectively. (FDA briefing on IQOS approval)

Leave it on for a few minutes before showering and using your regular shampoo and conditioner

Remember your why for recovery: Consistently remind yourself why you quit smoking and review literature that supports those thoughts

(And these negative results were achieved without the chemicals in most e-cigarettes/vapes that make them even more harmful, causing maladies including

Some classical Hanafi scholars held the stricter view that both are broken