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Inhaling diacetyl has been linked to a serious lung condition known as bronchiolitis obliterans, often called popcorn lung, particularly among factory workers exposed to high levels

Flavor variety: Options from fruits to tobaccos versus plain tobacco

Many smokers are aware of the damaging effects that their habit is causing on their pets and may choose to open windows, use air filters or take smoking breaks outside every now and then

While some are concerned that the tobacco-free nicotine-delivery devices may not be entirely healthy, many doctors are recommending them as a comparatively healthy alternative to traditional cigarettes for people who have trouble kicking the habit.