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What is Second-Hand Smoke?

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Second-hand smoke is a mix of smoke from a lit cigarette, pipe or cigar, plus smoke blown into the air by the person smoking.

How harmful is second-hand smoke?
Second-hand smoke is poisonous and has over 4000 chemicals, including 50 that can cause cancer. Some of the chemicals in second-hand smoke are:

• Benzo[a]pyrene – found in coal tar, one of the most potent cancer-causing chemicals.
• Formaldehyde – used to preserve dead animals.
• Hydrogen cyanide – used in rat poison.
• Ammonia – used to clean floors and toilets.

Two thirds of the smoke from a burning cigarette that enters into the air can be inhaled by anyone in that area.

How does second-hand smoke harm your health?
People who do not smoke and who are exposed regularly to the toxic chemicals in second-hand smoke can suffer serious and life-threatening health concerns. In the long term, people exposed to second-hand smoke have a greater risk of suffering from lung cancer, nasal sinus cancer, heart disease, stroke, and breathing problems, including increased coughing, wheezing, pneumonia, bronchitis, and asthma. People who do not smoke will suffer from the effects of breathing second-hand smoke right away. Even as little as 8 to 20 minutes can cause physical reactions linked to heart disease and stroke, such as increased heart rate, less oxygen to the heart, and constricted blood vessels that increase blood pressure and make the heart work harder.

Pregnant women exposed to second-hand smoke can have a greater risk of miscarriages and babies with low birth weight.

How does second-hand smoke harm babies and children?
Children are at higher risk of getting sick from second-hand smoke because their lungs are still developing and easily damaged. Babies also inhale more smoke because they breathe faster than adults.

Second-hand smoke is harmful to babies and children in the following ways:
Babies who breathe second-hand smoke have a greater chance of dying from Sudden Infant Death Syndrome (SIDS), also known as crib death. For more information, see HealthLinkBC File #46 Sudden Infant Death Syndrome.

Children exposed to second-hand smoke have a greater risk of getting lung infections, such as bronchitis and pneumonia. They also get more ear infections and suffer more from chronic coughing, wheezing, and breathing problems.

Second-hand smoke can cause fluid to build up in the inner ear, which can cause an ear infection. Second-hand smoke is harmful to children with asthma and other chronic lung conditions because the second-hand smoke makes the health conditions worse. Children who do not have asthma are more likely to get asthma when exposed to second-hand smoke.

How can I prevent exposure to second-hand smoke?

• To protect your family from second-hand smoke, make your home and car smoke-free.
• Do not let anyone smoke near your child.
• Encourage family and friends to create a smoke-free environment.

Smoke from 1 cigarette can stay in a room for hours, even with an open window. Many of the toxic chemicals remain in the air and the carpets, curtains, furniture, and clothes. Air purifiers and ventilation systems may remove some of the smoke, but these may not remove all the toxic chemicals.