Fewer children in Ireland are drinking, smoking, taking drugs, and having sex, according to a new study.

The Health Behaviours in School-aged Children 2018 Study for Ireland was funded by the Department of Health and carried out by researchers at NUI Galway. The research forms part of a wider World Health Organization study into the health of children across the globe, The Irish Times reports.

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Researchers surveyed 15,500 children between the ages of 10 and 17 from more than 250 primary and secondary schools in Ireland.

Almost two-thirds of young people (64 percent) say they've never had an alcoholic drink, an increase of six percent since the 2014 report, according to Today FM.

Credit: Getty Images

Credit: Getty Images

The study finds one in five children (22 percent) reported trying e-cigarettes, but only one in ten tried smoking, a drop of five percent, 

There was also a 3 percent drop in the number of 15-17-year-olds who reported having sex, down to 24 percent.

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However, bullying is a rising concern, with 30 percent reporting they had been bullied in the past couple of months, up from 25 percent in 2014. Of those surveyed, 16 percent reported having been a victim of online bullying.

Children are also reporting less life satisfaction and happiness. There was  a four percent drop in happiness among children, compared to 43 percent in 2014. Girls reported being significantly less happy than boys.