The vapor ideally contains virtually zero particulate matter or tar (tobacco residue), and significantly lower concentrations of noxious gases such as carbon monoxide.

Asphalt concrete pavements-especially those at airfields-are sometimes called tarmac for historical reasons, although they do not contain tar and are not constructed using the macadam process.

As such, the inhaled smoke contains less tar and nicotine.

Cigarettes which claim to contain lower tar and nicotine.

Electronic hookahs are often flavored and, unlike traditional hookah smoking, do not contain tar or smoke.

Cigarettes also contain tar, carbon monoxide, cyanide and over 3,000 other chemicals.

These products may contain tar, salicylic acid, zinc pyrithione, ketoconazole, sulfur, or selenium, any of which may be effective.

Vapor ideally contains almost no particulate matter or tar, and much less noxious gas such as carbon monoxide.

Although the cigarette is described as mild, it contains similar tar and nicotine levels to Marlboro Red.

Patches and gum - things that don't contain carbon monoxide or tar.