Second hand smoking has been recognized harmful to other people.

二手烟已经被确认对其他人有危害。

youdao

He conducted a rigorous experiment on the effect of second hand smoking.

他针对吸二手烟的影响进行了一次严谨的实验。

youdao

It is to say the harmfulness of second hand smoking, urging people especially youngsters to stay away from cigarettes is still a positive message.

这么说起来﹐强调二手烟的危害﹐促使人们﹐特别是年轻人远离香烟﹐这是很有积极意义的。

youdao

The most common cause of COPD is long-term smoking or years of exposure to second-hand smoke.

VOA: standard.2010.06.21

And just like smoking and its second-hand health effects, second-hand fat should be a serious societal concern.

FORBES: Obesity: The New 'Just Say No' For 2013

Previous reports recorded a "sharp decrease" in "non-smokers exposure to second-hand smoke" following the ban in smoking in public places in 2006.

BBC: Scottish Health Survey: Obesity still problem for Scots

Worldwide, as many as 40% of children, 33% of non-smoking men and 35% non-smoking women were exposed to second-hand smoke in 2004, researchers found.

BBC: Passive smoking 'kills 600,000' worldwide