烟草对健康的损害大多都直到使用后多年甚或几十年才显现出来。
Most of tobacco’s damage to health does not become evident until years or even decades after the onset of use.
既使感觉到烟草对健康有影响，多数人也没有意识到烟草造成的危害有多大。
Most people are unaware of the extent of the harm that tobacco causes, even if they have some idea that it is a health risk.
只有少数的几个研究分析了无烟烟草对健康的影响，得出来的结并不如所预期的那样联系紧密。
Only a handful of studies have analyzed the heart effects of smokeless tobacco, and the findings are not as strong as the researchers expected.
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