Electronic cigarettes used by smokers trying to quit the lethal habit of smoking can actually cause lung damage, a new study has claimed.
Scientists warn that the devices can trigger changes to the lungs, despite the fact that they are being marketed as a potentially safer alternative to normal cigarettes.
The study also added new evidence to the debate over the safety of alternative nicotine-delivery products.
E-cigarettes are devices that deliver nicotine through a vapour, rather than smoke. There is no combustion involved but the nicotine in the device is still derived from tobacco.
There has been much debate over the safety and efficiency of the products, but little scientific evidence to support either claim.
Researchers from the University of Athens in Greece aimed to investigate the short-term effects of using e-cigarettes on different people, including people without any known health problems and smokers with and without existing lung conditions.
The study included 8 people who had never smoked and 24 smokers, 11 with normal lung function and 13 people with either chronic obstructive pulmonary disease (COPD) or asthma.
Each person used an electronic cigarette for 10 minutes.
The researchers then measured their airway resistance using a number of tests, including a spirometry test.
The results showed that for all people, the e-cigarette caused an immediate increase in airway resistance, lasting for 10 minutes. In healthy subjects (never smokers) there was a statistically significant increase in airway resistance from a mean average of 182 to 206 per cent.
In smokers with normal spirometry (measuring of breath) there was a statistically significant increase from a mean average of 176 to 220 per cent.
In COPD and asthma patients the use of one e-cigarette seemed to have no immediate effect to airway resistance.
“We do not yet know whether unapproved nicotine delivery products, such as e-cigarettes, are safer than normal cigarettes, despite marketing claims that they are less harmful. This research helps us to understand how these products could be potentially harmful,” Professor Christina Gratziou, one of the authors and Chair of the ERS Tobacco Control Committee, said.
“We found an immediate rise in airway resistance in our group of participants, which suggests e-cigarettes can cause immediate harm after smoking the device. More research is needed to understand whether this harm also has lasting effects in the long-term,” he said.
The result was presented at the European Respiratory Society’s Annual Congress in Vienna.