A survey of more than 13,500 Irish children, aged eight to 17 years, found a drop in reported levels of smoking and drunkenness, but an increase in the number of older children who say they have had sex.
Occasions of smoking and drunkenness dropped between 2014 and the last study conducted by the Irish Health Promotion Research Center in 2010, while the number of students saying they had never consumed alcohol increased, irishtimes.com reported.
Smoking, alcohol use and cannabis use were more commonly reported among boys and older children. In 2010, a total of 28% children said they had smoked, last year that figure fell to 16%.
Children aged between 15 and 17 years were asked about sex as part of the survey. Some 27% said they have had sex, up from 23%. More boys than girls said they had had sex, 31% compared to 21%.
Of those who reported having sex, one third said they used the birth control pill as a form of contraception when last having intercourse, and almost three quarters said they used condoms.
According to the study, reported levels of fruit and vegetable consumption increased and consumption of sweets and soft drinks decreased from 2010.
The number of children eating fruit once a day rose from 20% in 2010 to 23% in 2014. Similarly the numbers eating vegetables daily rose from 20-22%.
Meanwhile, sweets are less favored than in the past with the number eating them every day falling 10 points to 27% from 37% in 2010.
The number consuming a soft drink every day also fell from 21 percent in 2010 to 13 percent last year.