It's certainly concerning, and certainly gives pause if one were to say e-cigarettes were safe and could be used by all people without consequences.
The vaped-upon mice had higher signs of DNA damage throughout several of their organs, namely the lung, heart and bladder.
"We know from talking to teachers that in schools where smoking rates are high in the local community, cigarettes are sold to younger children by teen smokers in order to maintain their own smoking". "The results may take years to come in because cancer is such a slow process", he told The Guardian.
Peter Hajek, director of the Tobacco Dependence Research Unit at Queen Mary University of London, said the study methods are of "unclear relevance for effects of vaping". The findings, though preliminary, indicate that the devices - which aerosolize nicotine and contain no tobacco - may not be as safe as previously assumed.
The main cancer risk with tobacco cigarettes is caused by the release of a number of carcinogenic compounds when they are burned and inhaled. NRT has always been known as a much safer alternative to smoking'.
Recent studies have shown that e-cig users have 97 per cent less of a lung cancer-causing component known as NNAL in their bodies than tobacco smokers.
In the meantime, scientists are turning to animal experiments, which may be able to provide further evidence as to the full-blown effects of e-cigarette smoking in about a year.
Tang went on to look at human lung and bladder cells and found that exposing the cells to nicotine and its breakdown products made the cells turn into tumour tissue more easily.
This breakthrough follows on from a report published a week earlier (23 January), in which it was suggested that e-cigarettes can help adults to quit smoking conventional cigarettes.
It's the first evidence we have that nicotine can be carcinogenic in and of itself, said Dr Roy Herbst, chief of medical oncology at Yale Cancer Centre, and chair of the American Association for Cancer Research's Tobacco and Cancer sub-committee.
'The tobacco industry uses every trick in the book to snare new young people into becoming smokers, with the result that 36 children start smoking every day in Scotland'.
Last week a major USA report into the health effects of e-cigarettes found that vaping might be useful to help people quit smoking.
"Research in people has shown that those who make a complete switch from smoking tobacco to e-cigarettes can significantly reduce their exposure to key harmful chemicals in tobacco smoke".