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Tobacco smoke contains over 4,000 different chemicals, many
of which are harmful. These include:
- Benzene
- Formaldehyde
- Ammonia
- Hydrogen cyanide
- Acetone
- Arsenic
The three main components of smoke are nicotine, carbon monoxide
and tar. All of which can cause disease in the human body.
Nicotine
Nicotine is a powerful, fast acting and addictive drug. When
inhaled, nicotine is absorbed into the bloodstream and the
effects are felt on the brain within 7 to 8 seconds.
The immediate effects of nicotine include:
- Increase in heart rate
- Increase in blood pressure
- Constriction of small blood vessels under the skin
- Changes in body composition
- Increase in hormone production
Carbon Monoxide
Carbon monoxide is a poisonous gas found in high concentrations
in cigarette smoke. When in your system, it reduces the amount
of oxygen that is carried around the body. Oxygen is essential
for body tissues and cells to function efficiently. If the
supply of oxygen is reduced for long periods, your body can
experience problems with growth, repair and absorption of
essential nutrients.
Carbon monoxide can also affect the activity of the heart.
This, combined with other changes in the blood due to smoking
and diet, can lead to heart disease and other circulation
problems.
Tar
Many of the substances in tar have been proven to cause cancer
in animals. Irritants in tar can also damage the lungs. Since
1992, the law requires that tar and nicotine yields be displayed
on cigarette packets.
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