The Japanese team of researcher present in the table (shown above) the number of samples (column 2) and the respective results. The average levels of formaldehyde found in all samples was calculated at 4.2μg/10 puffs. Therefore, on average, the levels of formaldehyde in e-cigarettes are up to 50 times lower compared to tobacco cigarette smoke.
Obviously, we have to realize that focusing the discussion on one of the tens of carcinogens present in tobacco cigarette smoke is misleading. Even if e-cigarettes contained similar, or higher, levels of formaldehyde, they do not contain the majority of other toxic and carcinogenic substances present in cigarette smoke. Overall, any residual risk from e-cigarette use is orders of magnitude lower than smoking. This is exactly what smokers need (and deserve) to know.
***************************** UPDATE ******************************
After my comment, Prof Kunugita contacted me again. He mentioned that the newsmedia reports refer to a recent evaluation of a newer-generation device, in which he found 1600μg formaldehyde per 15 puffs. It is true that this level is 10 times higher than what is present in tobacco cigarettes. However, this is an unpublished result, a single extreme case out of the many products he tested, and we do not know what went wrong in that case (e.g. high power levels, low levels of liquid inside, malfunctioning device etc). Still, the media frenzy is completely inappropriate.
This confusion shows why it is important for a new, systematic evaluation of aldehydes release, taking into consideration realistic conditions and puffing patterns together with evaluation of temperatures of evaporation. This is exactly what we are preparing to do, starting in a few days.
懒得翻译了,按平均值电子烟是低50倍,但有一个油是1600ug。原因未明,那个做实验的教授也说了,这不是正式报告,他要媒体道歉。
数据自己看,
http://www.ecigarette-research.com/web/index.php/2013-04-07-09-50-07/2014/188-frm-jp