Scientists have discovered that unhappiness may shorten one’s lifespan more than smoking.

Data from 12,000 Chinese adults revealed that having a poor mental state, as a result of feeling lonely, hopeless, and having restless sleep, can cut the average lifespan by more than a year and a half.

Scientists say their research, which was published on Tuesday September 27, in the journal Ageing, shows that mental health is just as important as physical health.

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