Though the authors note as a curiosity that campaigns against secondary smoke predated the evidence that it did any harm, they show no desire to explore this seemingly reversed causality.

先有了抗议二次吸烟的运动，然后才出现相关的证据，虽然作者对此表示好奇，但他们并不打算深究这种似乎前后颠倒的因果关系。

youdao

Note the Smoke Alarm above the grandfather clock.

注意：以上祖父时钟烟雾报警器。

youdao

Note that if the group is under fire and crossing a danger area, smoke should be used extensively, and security for the crossing elements should be provided by suppression fires.

如果在穿越危险地带时遭到敌火力打击，就要多用烟雾弹，用压制火力掩护穿越的队伍。

youdao

Mostly, though, smoke is used as an accent note a counterpoint applied much the same way spice or bitterness might be used to amplify the earthy notes in chocolate.

WSJ: Smoky Desserts: Smoke Signals

Though the authors note as a curiosity that campaigns against secondary smoke predated the evidence that it did any harm, they show no desire to explore this seemingly reversed causality.

ECONOMIST: A question of dodgy science