Studies have found that nicotine can be as difficult to resist as alcohol or the drug cocaine.

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

Nicotine replacement products provide the body with small amounts of the chemical through forms other than cigarettes.

VOA: special.2010.03.09

As bad as those chemicals are, nicotine may be the most threatening of them all.

VOA: special.2010.03.09

Chantix works on nicotine receptors in the brain to reduce the urge to smoke.

VOA: special.2010.03.09

Experts say nicotine can kill a person when taken in large amounts.

VOA: special.2010.03.09

The amounts of nicotine are slowly reduced over time.

VOA: special.2010.03.09

The body grows to depend on nicotine.

VOA: special.2010.03.09

Nicotine is a poison found in tobacco.

VOA: special.2010.03.09

They do not contain nicotine.

VOA: special.2010.03.09

To accurately assess the level of second-hand smoke exposure, researchers tested for cotinine, which is produced when nicotine is metabolized.

VOA: standard.2010.06.15

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