Smokeless cigarettes not as harmless as claimed, study says

Users of new iQOS 'heat not burn' devices speed up their 'puff rate' to inhale more nicotine, researchers find

The new "heat not burn" smokeless cigarette devices are not as harmless as their manufacturer claims, according to a new study.

iQOS - which stands for "I quit ordinary smoking" - is made by Philip Morris International, best known as the manufacturer of Marlboro cigarettes. PMI, the biggest tobacco company in the world, says its future is "smoke-free", and it is investing in heated tobacco products, such as iQOS, and e-cigarettes, both of which it says are safer options.