Are E Cigs safe???

Study 1

Inhaled formaldehyde has a reported slope factor of 0.021 kg of body weight per milligram of formaldehyde per day for cancer ( Among persons with a body weight of 70 kg, the incremental lifetime cancer risk associated with long-term cigarette smoking at 1 pack per day may then be estimated at 9×10−4. If we assume that inhaling formaldehyde-releasing agents carries the same risk per unit of formaldehyde as the risk associated with inhaling gaseous formaldehyde, then long-term vaping is associated with an incremental lifetime cancer risk of 4.2×10−3. This risk is 5 times as high (as compared with the risk based on the calculation of Miyake and Shibamoto shown in Figure 1), or even 15 times as high (as compared with the risk based on the calculation of Counts et al. shown in Figure 1) as the risk associated with long-term smoking. In addition, formaldehyde-releasing agents may deposit more efficiently in the respiratory tract than gaseous formaldehyde, and so they could carry a higher slope factor for cancer.
R. Paul Jensen, B.S. Wentai Luo, Ph.D. James F. Pankow, Ph.D. Robert M. Strongin, Ph.D. David H. Peyton, Ph.D. Portland State University, Portland, OR 

E-Cigarettes ‘Contain A Million Times More Cancer-Causing Chemicals Than Polluted Air

Chinese experts have called for a ban on e-cigarettes after a study found that they contained levels of carcinogens a million times higher than outside air.
A study by Baptist University in Hong Kong found levels of polycyclic aromatic hydrocarbons (PAHs) a million times higher than roadside air.
The chemicals are a byproduct of burning petroleum, and have been linked to cancer.
The researchers tested 13 kinds of e-cigarettes, and found levels ranging from 2.9 nanograms to 504.5 nanograms per millilitre.
The Hong Kong Council on Smoking and Health has called for a ban on E-cigarttes in the wake of the find, the South China Morning Post reported.

‘The level in e-cigarettes is at least one million times more than roadside air in Hong Kong,” said Dr Chung Shan-shan of Baptist University.

‘Even though we don’t know the exact number of e-cigarettes one should take, not to mention that many of the carcinogenic effects are cumulative, I don’t think there is a safe margin.’

Study 2

Vaping 'no better' than smoking regular cigarettes
An estimated 2.6 million people in the UK use the devices
Vaping could be “no better” than smoking regular cigarettes and may be linked to cancer, scientists have found.
The study which showed that vapour from e-cigarettes can damage or kill human cells was publsihed as the devices are to be rolled out by UK public health officials as an aid to quit smoking from 2016.
An estimated 2.6 million people in the UK currently use e-cigarettes.
The study involved exposing human cells with both nicotine-based and nicotine-free e-cigarette vapour.
Researchers found that the cells which had not come into contact with vapour were more likely to become damaged or die than those which had not.
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The paper, which was published in the Oral Oncology journal, concluded that the tests “strongly suggest” that electronic cigarettes are “not as safe as their marketing makes them appear to the public.”
"Vapourised e-cig liquids induce increased DNA strand breaks and cell death.”
Dr Jessica Wang-Rodriguez, chief of pathology at the San Diego branch of the US Department of Veteran Affairs and co-author of the research said “evidence to date” suggested that e-cigarettes are “no better than smoking regular cigarettes."
She explained that many studies have shown that nicotine can damage cells, however her team's study indicates that other components in e-cigarettes may be carginogenic.
Should E-cigarettes be banned indoors?
"For now, we were able to at least identify that e-cigarettes on the whole have something to do with increased cell death," she said. 
However, Dr Wang-Rodriguez stressed that the results may not replicate the processes in the human body, as the amount of vapour used was "similar to someone smoking for hours on end".
Further researcher is now needed to determine the long-term effects of vaping, as well as whether the DNA damage will lead to mutations that result in cancer.  
The research is part of an effort to pinpoint whether e-cigarettes are harmful, as the industry has grown rapidly in the past few years.
Recent research from Harvard University on 51 e-cigarette liquids found that some of the chemical components can cause a rare condition called 'popcorn lung'.
The irreversible, life-threatening disease narrows the airways in the lungs and weakens the organs by causing scarring or inflammation.