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Health Sciences 1001A/B Lecture Notes - Sidestream Smoke, Coronary Artery Disease, Canadian Cancer Society

Health Sciences
Course Code
HS 1001A/B
Shauna Burke

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Chapter 11
Tobacco Use
Required Reading: Chapter 11, pp. 299-327
Smoking is the most preventable cause of disease and premature death in Canada
Every cigarette a person smokes reduces life expectancy by approximately 11 minutes
More than 37 000 people die prematurely each year in Canada due to tobacco use
Tobacco in any form is unsafe
Tobacco use is widespread in our society
Nicotine Addiction
An addiction involving physical dependence on the psychoactive drug Nicotine a poisonous,
addictive substance found in tobacco and responsible for many of the effects of tobacco”
Addicted users must keep a steady amount of nicotine in the blood and going to the brain
If that amount decreases, they experience withdrawal symptoms
Nicotine addiction can start within a few days of smoking and after just a few cigarettes
Health Hazards of Cigarette Smoking
Negative effects on nearly every organ of body and decrease overall health
Related to more than two dozen diseases and conditions
Contain more than four thousand chemicals, at least fifty that are carcinogens or co-carcinogens
and/or irritate the tissues of the respiratory system
Smoke contains carbon monoxide in concentrations four hundred times greater than safety
threshold in workplaces
Health Hazards of Cigarette Smoking
Amount of chemicals in each cigarette is small, however:
o It is cumulative the chemicals build up in our systems
o Amount stored in body increases with each puff (> 10 puffs per cigarette)
o > 1 year at 1 pack per day = 73 000 puffs of chemical
Long-Term Effects of Smoking
Decrease life expectancy:
o On average, smokers live 10-15 years less than nonsmokers
Environmental Tobacco Smoke (ETS)
Commonly called second hand smoke
Environmental Tobacco Smoke (ETS)
Consists of:
o Mainstream smoke exhaled by smokers
o Sidestream smoke from burning of end of the cigarette, cigar, or pipe
Sidestream smoke contains higher concentrations of toxic and carcinogenic compounds (at least
2x the nicotine and tar)
Nearly 85% of the smoke in a room where someone is smoking is sidestream smoke
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