Nicotine is a poison found in tobacco.

VOA: special.2010.03.09

In the first example, you could be at a social gathering and you really feel the need for some nicotine.

在第一个例子中，你可能在一个社交聚会上，你特别想找个地方抽根烟。

Do you mind 课堂 - SpeakingMax英语口语达人

A urine test that detects nicotine means no job is offered.

VOA: standard.2010.02.18

In their study, the researchers tested blood for cotinine,a chemical which is produced when nicotine is metabolized, so they got an objective measure of how much smoke the teenagers were exposed to.

VOA: standard.2010.03.04