In particular , nicotine is a highly flexible molecule .

尼古丁是一种尤其高活性的分子。

It 's the nicotine in cigarettes that can stain teeth .

香烟所含的尼古丁会让牙齿生斑。

Likewise , nicotine will disrupt your sleep .

同样地，尼古丁会破坏你的睡眠。

Like their conventional counterparts , electronic cigarettes contain nicotine .

与传统香烟一样，电子香烟同样含有尼古丁。

If you are quitting smoking , get nicotine patches and other cessation aids .

如果你想戒烟，就要买尼古丁贴片和其它戒烟辅助工具。