Nicotine is only one of the many harmful ingredients found in cigarettes.
There are over 4,000 other harmful chemicals that can be found in tobacco smoke.
Among those are:

• carbon monoxide (the dangerous gas that comes out of our cars)
• formaldehyde (used to preserve dead bodies)
• ammonia (kitchen and bathroom cleaner)
• carbon dioxide (which contributes to global warming)
  

Many harmful metals are also found in cigarettes.

• aluminum
• copper
• lead
• mercury
• zin

People who smoke breathe all of these deadly chemicals into their lungs. Those who market cigarettes are literally marketing poisons.