The researchers said that if the findings will be confirmed in future studies, it could mean that e-cigarettes, always been considered to be the safer alternative to traditional cigarette and tobacco products, also carry cancer risk through the nicotine that they deliver.
However, NNAL levels for vapers are still significantly higher than for non-smokers, the team found.
Showing the benefits of vaping, and its usefulness in quitting smoking, a study funded by Cancer Research UK found that the blood of e-cigarette users had lower amounts of tobacco-related carcinogens than their tobacco-smoking counterparts. About 7 percent of teens reported using cigars, 4.5 percent said they used smokeless tobacco and 6.6 percent reported electronic cigarette use. Study author Moon-shong Tang also noted to Bloomberg that it's not clear whether conventional cigarettes or e-cigarettes would be more harmful.
There is no safe level of smoking, as even one cigarette a day increases by about 50% the risk for coronary artery disease and 30% for stroke, according to a new British scientific study.
Regulators may have had a change of heart about the danger of using e-cigarettes, but scientists would beg to differ.
The tests were also carried on cultured human lung and bladder were found to have similar results. The popularity of e-cigarettes decreases with age and is used more by teenagers and young adults. "Based on these results I can not conclude that E-cig smoke is safer than tobacco smoke in terms of cancer susceptibility of smokers".
While tobacco smoke contains a host of risky chemicals, e-cig liquid consists only of nicotine and relatively harmless solvents. "In both conditions nicotine is in aerosol state and reaches lung via the same path".
It would have been nice if this study had taken the extra step of exposing mice to tobacco smoke as well, and then compared them head-to-head against the mice that inhaled e-cigarette vapor, said Anthony Alberg.
Nevertheless, an important point to consider is that other health risks associated with smoking tobacco are most definitely avoided by e-cigarettes.
All in all, a rather unclear picture emerges. The results, published Monday (January 29) in PNAS, suggest that vaping increases the risk of developing cancer and heart disease and reinforce the research showing e-cigarettes' risks to human health.