Nicotine is a highly addictive substance found in tobacco.
Никотин - это вещество, вызывающее сильную зависимость, которое содержится в табаке.
Определения
A toxic, colorless or yellowish oily liquid that is the chief active constituent of tobacco, used as an insecticide and is also the addictive substance in cigarettes.
Nicotine is responsible for the addictive nature of smoking.