nicetin

例句：

1. 1.This medicine contains nicotinic acid, which is beneficial for your health.
   这种药物含有尼古丁酸，对你的健康有益。
2. 2.The nicotine in cigarettes is a highly addictive substance.
   香烟中的尼古丁是一种高度上瘾的物质。
3. 3. Nicotine withdrawal can cause severe symptoms such as anxiety and irritability.
   尼古丁戒断可能导致焦虑和易怒等严重症状。