What are the most dangerous chemicals in cigarettes?

There are more than 4,000 chemicals in each cigarette. Here's a list of some of the most dangerous:

• Ammonia-This is used to boost the absorption rate of nicotine.
• Arsenic-This is used to protect tobacco plants from pests, but remains in the resulting cigarette.
• Cadmium-This metallic compound in tobacco comes from acidic soil.
• Formaldehyde-This byproduct of cigarette smoke is the same colorless gas commonly used to preserve bodies for burial.
• Acetone-This byproduct from burning a cigarette is the same stuff found in nail polish remover.
• Butane-This byproduct also is used to help you light your cigarette, as an ingredient in lighter fluid.
• Propylene Glycol-This is added to keep tobacco from drying out and to speed up the delivery of nicotine to the brain.
• Turpentine-This adds flavor to menthol cigarettes.
• Benzene-This is another byproduct from burning a cigarette and can be found in pesticides and gasoline.
• Lead and Nickel-These are metals.