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While e-cigarettes are considered less harmful than regular cigarettes (the aerosol generally contains fewer toxic chemicals than the 7,000 found in regular cigarette smoke), that doesnt mean they are safe, according to the CDC

Silagy C, Lancaster T, Stead L, Mant D, Fowler G

A puff from an e-cigarette creates an instant head rush with similar effects to harder drugs such as cocaine, flooding the brain with the feel-good chemical dopamine

It's not for the weak of heart and is well-known for its strong flavor

Oftentimes, manufacturers will also list the size of particulate matter that an air purifier can defend against, sometimes listed as a PM value