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1.Nicotine is a highly addictive substance that can cause addiction to tobacco products.
尼古丁是一种高度上瘾的物质，可能导致对烟草产品的成瘾。
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2. The nicotine in cigarettes has been shown to increase the risk of heart disease and lung cancer.
香烟中的尼古丁已被证明会增加心脏病和肺癌的风险。
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3. Smoking cessation programs often use nicotine replacement therapy to help smokers quit.
戒烟计划通常使用尼古丁替代疗法来帮助吸烟者戒烟。