The study's authors surveyed 12,395 students and analyzed nine risk behaviors, including excessive alcohol use, illegal drug use, heavy smoking, high media use and truancy.

该研究的作者调查了12395名学生并分析了九种危险行为，包括过度使用酒精、非法使用毒品、大量吸烟、频繁使用媒体和逃学。

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However, heavy smoking increased.

但是，重度吸烟者人数却增加了。

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Heavy smoking ruined his health.

吸烟过量毁坏了他的健康。

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Here, heavy drinking, heavy smoking and post-Soviet stress have led to male life expectancy falling to just 59 .

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Voice changes also occur with viral and bacterial infection, like the common cold or flu, and are one of the characteristics of heavy smoking.

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Smoking, often heavy smoking, is common when you have schizophrenia.

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