Police took action against a record 3,578 people in cannabis cases in 2018, up 570 from the previous year, data released by the National Police Agency showed Thursday.

The NPA data showed the figure per 100,000 people doubled from 1.7 in 2014 to 3.5 in 2018, with a sharp growth seen among teens and those in their 20s. An NPA official said, "We are worried that more youths may use the drug without recognizing the hazards."

By age group, the number per 100,000 people came to 6.0 among those aged 14 to 19, a more than fivefold jump from 1.1 in 2014. The figure more than doubled from 5.0 to 12.2 among people in their 20s while it increased from 4.1 to 7.3 among those in their 30s.