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NCERT Exemplar · Q42

Q.Do you consider passive smoking is more dangerous than active smoking? Why?

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Passive smoking can be more dangerous than active smoking in important respects: the unfiltered "sidestream" smoke a passive smoker breathes carries higher concentrations of several toxic substances than the filtered "mainstream" smoke the active smoker inhales, and passive smokers have no control over their dose or duration of exposure.

To judge whether passive smoking is more dangerous than active smoking, we first need to separate the two kinds of smoke a burning cigarette produces, because they are not chemically identical.

Mainstream smoke is what the active smoker draws through the length of the cigarette and its filter directly into the lungs. Passing through the tobacco column and the filter removes or dilutes some of the harmful constituents before they reach the smoker's airway.

Sidestream smoke is what rises directly off the burning tip between puffs, entering the surrounding air with no filtration at all. Because it bypasses both the unburned tobacco column and the filter, sidestream smoke contains higher concentrations of several toxic and carcinogenic substances — including ammonia, carbon monoxide, nicotine, and various tar components — than the mainstream smoke inhaled by the active smoker.

A passive (or "involuntary") smoker breathes a mixture of this concentrated sidestream smoke together with the mainstream smoke exhaled by the active smoker. Several factors compound the risk for the passive smoker:

Important

  • No filtration and no control over dose: the active smoker at least draws smoke through a filter and can choose to stop; the passive smoker inhales unfiltered air with no way to regulate how much or for how long.
  • Vulnerable exposed groups: infants, young children, pregnant women, and people with pre-existing heart or respiratory conditions are frequently the ones exposed to secondhand smoke in homes and workplaces, and they are more susceptible to its effects than a healthy adult smoker.
  • Cumulative, often lifelong exposure: a child raised in a household with a regular smoker can accumulate years of continuous exposure to secondhand smoke — including the more concentrated sidestream component — well before they are old enough to leave that environment. …

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