NON-SMOKERS in Portugal inhale less carbon monoxide than smokers but still breathe in levels above the European average.

The latest Help-Comets Study, researched and published as part of the Europe-wide campaign, A Life without Tobacco, took in 223,050 Europeans, including 8,389 Portuguese.

It showed that in Portugal the average person inhales 4.4 parts of carbon monoxide per millimetre of air.

A year ago the figure was higher at around 5.6 ppm, although that figure soars for smokers to between 19.8 and 20.9 ppm.