The study didn 't look at nicotine gum , inhalers or sprays , or at varenicline ( which wasn 't licensed at the time the study started ) .
这项研究没有观察尼古丁口香糖、吸入器或喷雾器，或瓦伦尼克林（研究开始时，它还没得到许可证）。
These include nicotine patches , which slowly release nicotine into the bloodstream , and nicotine gum , lozenges , and inhalers which provide a ' hit ' of nicotine when you get a craving .
