WEBVTT

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Filter ventilation in cigarettes

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TRANQUIL MUSIC

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VOICE-OVER:
Did you know nearly all cigarettes

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have tiny holes
in the filter paper?

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WALTHER KLERX: In some cigarettes,
the holes are visible to the naked eye.

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In other cigarettes, you must
use a microscope to see them.

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These holes cause the smoker
and the smoke machine

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to inhale extra air.

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REINSKJE TALHOUT:
We use this smoke machine to compare

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the tar, nicotine and carbon monoxide
emissions of various products.

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In Europe, we've agreed
to use the so-called ISO method to do so.

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The ISO method involves keeping
the filter holes open during testing.

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But a real smoker wants to consume
a certain quantity of nicotine

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because he is
addicted to it.

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So, he will adapt
his behaviour.

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The smoker will take more drags,
inhale more deeply

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and partially block the filter holes
with his lips or fingers.

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VOICE-OVER:
So, this study also uses

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the Canadian Intense protocol,
in which filter holes are sealed.

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TALHOUT: This gives a better idea
of what a real smoker consumes.

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In the ISO method, every minute,
a 35-millilitre drag is taken.

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In the Canadian Intense protocol,
every thirty seconds

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a 55-millilitre drag
is taken.

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KLERX: Now, based on the filter,
we can see

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what the effect
of the different methods is.

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With the ISO method,
the filter is lightest

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so fewer components
were consumed

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than with the Canadian Intense method.
That means

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that if you take bigger drags
more often and seal off the holes

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you consume more harmful components
than when you don't do so.

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So, holes in the filter do not
make a cigarette less harmful.

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Want to know more
about filter ventilation in cigarettes?

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Surf to:
rivm.nl/filterventilatie.