What chemicals are in your cigarette?

It's not just nicotine. You may be shocked to learn what else you're inhaling when you smoke.

woman pugging on a cigarette

Updated on March 1, 2024.

In addition to highly addictive nicotine, cigarette smoke contains over 4,000 chemicals. Here's what you're inhaling with each puff:

  • Arsenic (also found in rat poison)
  • Ammonia (a poison; present in many household cleaners)
  • Acetone (also found in fingernail-polish remover)
  • Benzene (also used as an industrial solvent and found in car exhaust)
  • Carbon monoxide (also found in car exhaust-pipe fumes)
  • Cadmium (used in rechargeable batteries)
  • Cyanide (a poison used in gas chambers)
  • DDT (an insecticide)
  • Formaldehyde (also found in embalming fluid)
  • Lead (a poison that's been removed from nearly all paints)
  • Mercury (a highly poisonous substance; easily absorbed through respiration)
  • Nickel (also poisonous; a known cancer-causing agent)
  • Hydrogen cyanide (a deadly poison used in gas chambers)
  • Hydrogen sulfide (sewer gas)
  • Polonium-210 (a radioactive substance)
  • More than 50 cancer-causing agents (carcinogens)

And, of course, nicotine, which isn't just addictive, it's a natural insecticide (it protects the tobacco plant from bugs). In its pure form, nicotine is a deadly poison. One drop could kill a human in minutes.

More On

Sub it out

video

Sub it out
Various environments or actions may trigger you to want to go back to your old habit. To combat that very real temptation, pick a substitute behavior ...
4 shocking ways smoking affects your body

article

4 shocking ways smoking affects your body
Read on for more reasons to quit.
What will (and won't) help you quit smoking for good

slideshow

What will (and won't) help you quit smoking for good
Finding the right quit aid for you doesn’t have to be complicated.
Get a buddy

video

Get a buddy
Breaking an addiction can be hard—and emotionally taxing. Don’t do it by yourself. Use the support of someone close to you, as well as someone who is ...
How to be tobacco-free

video

How to be tobacco-free
Congratulations! You’re taking your first steps toward a tobacco-free life. Learn about the benefits of quitting and get tools to help, including tips...