二手烟用英语可以翻译为"secondhand smoke"，即二手烟指的是在非吸烟者周围烟气的影响。这个词来自于"hand-to-hand"的英文短语，意为物物交换。

例句：

Smoking is not allowed in this restaurant because it creates secondhand smoke that can be harmful to others.

不允许在这家餐馆吸烟，因为它会产生对他人有害的二手烟。

Children are especially sensitive to secondhand smoke because their bodies are still developing.

儿童对二手烟尤其敏感，因为他们的身体仍在发育。

Secondhand smoke is a serious health risk and can cause lung cancer and heart disease.

二手烟是一种严重的健康风险，可能导致肺癌和心脏病。