Text lesson

Unit 1 — Chemical Reactions and Their Environmental Impacts

Science — Third Preparatory

3.6 Types of smoking and ways of exposure

Key points

Traditional smokingburning tobacco leaves in cigarettes (or other tobacco products).

Vaping (electronic smoking)heating a liquid that contains nicotine with an electronic device to produce an aerosol (vapour) that is inhaled.

There is a common misconception that vaping is less harmful.
It has been shown that both cause severe and direct damage to the lungs and heart.
Vaping liquids often contain high concentrations of nicotine, which causes rapid addiction and may cause acute heart and nervous problems.
Exposure to smoking products

Comparison aspect	Main idea	Keywords
Active smoking	the smoker deliberately inhales smoke from burning tobacco or the aerosol from a vaping device	smokerdeliberatelyinhalessmoke
Passive smoking	a non-smoker inhales the smoke exhaled by a smoker or the smoke that rises from the burning tip of the cigarette. That smoke has not passed through the filter so it can contain higher concentrations of toxic and carcinogenic gases. Non-smokers are therefore exposed to the same heart and respiratory diseases as active smokers	smokerinhalessmokeexhaled

Comparison of situations a person who smokes (active), a non-smoker sitting beside him (passive), and a person who vapes (active, with aerosol released into the air).
All three inhale harmful substances; the differences are the method (burning versus heating a liquid) and whether the person chose to inhale.

Unit 1 — Chemical Reactions and Their Environmental Impacts · 24 / 30

3.6 Types of smoking and ways of exposure