I don't belong in cigarettes but...but I'm used for?

When you drive I am released into the air.
Carbon Monoxide - I am odourless and rob the body of Oxygen.

I am used in the construction of roads and highways.
Tar – very sticky hundreds of chemicals.  Lots of chemicals stick to the tar.

I am a household glass cleaner.
Windex- Ammonia is added to enhance the taste by Tobacco Industry. 
Coincidently speeds nicotine to the brain

Lighting fires and keeping you warm should be my only task.
Butane – highly flammable

I help keep cars, buses, and trucks moving.
Benzene (Gasoline) – carcinogen

When you want to change the colour of your nails I can be very helpful. – Acetone
(Nail Polish Remover) - Added by Tobacco Industry to cigarettes to increase nicotine’s effectiveness

When you have a pest I am used to get rid of it.
Rat Killer – small amounts of Arsenic for pesticides

I am always being used and I am a great source of power.
Battery - Cadmium, a heavy metal found in batteries damages ulcer, kidney, and brain

I keep flesh from rotting and you can find me in a science lab or morgue.
– Formaldehyde – causes damages to lungs, skin, digestive system and also carcinogen.  This chemical that can prevent flesh from rotting is very strong.