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They are considered part of tobacco harm reduction, a strategy of reducing adverse health effects by providing low-risk nicotine products to substitute smoking 1

There is no rule here

But lately, a shift toward alternatives to cigarettes has taken hold among consumers, and Philip Morris has been surprisingly quick to embrace the idea that reduced-risk products could eventually supplant traditional cigarettes entirely

Lithium-ion batteries have been named as the culprit for a spate of Samsung mobile phone fires which led to a massive product recall

Ask a doctor before use if you have high blood pressure not controlled with medication