水烟中还包含着大量的尼古丁，这是烟草中主要的成瘾物质。
Shisha smoking also delivers significant levels of nicotine, the main addictive substance in tobacco.
尼古丁是成瘾物质。许多人发现即使自己真的想戒，要停止吸烟也非常困难。
Nicotine is an addictive substance and many people find it very hard to stop smoking, even when they really want to.
尼古丁是烟中的成瘾物质，如果人们可以通过吸烟以外的方式获得尼古丁，那么戒烟就会变得容易。
As nicotine provides the addiction in smoking if you get nicotine without the smoke you can give up easily.
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