Thirteen teenagers were arrested yesterday at two Wheaton area public high schools and charged with possession of marijuana, as Montgomery County police continued their efforts to curb marijuana smoking by students on or near public school grounds.

County police said yesterday's first arrests were made shortly before 9 a.m. at a public swimming pool adjacent to Wheaton High School at 12601 Datewood Dr. They said four male students between the ages of 15 and 17 were arrested by five special assignment county officers after the students allegedly were found smoking marijuana.

The second group of arrests took place shortly before 1 p.m. at Albert Einstein High School at 11135 Newport Mill Rd. police said. Four female and five male students between 16 and 17 years old were taken into custody after they were found allegedly either smoking or in possession of marijuana near school grounds, officials said.

Police said none of the 13 youths resisted arrest and that all were released to their parents' custody yesterday afternoon.

Including yesterday's arrest, a total of 23 students at Montgomery County High Schools have been arrested for marijuana possession since Monday, seven pupils of Bethesda-Chevy Chase High School were arrested Monday and three Winston Churchill High School students were arrested Tuesday.

Police officials said the arrests yesterday came after a week-long surveilliance of the two schools by plain-clothes county high schools currently are being watched in anticipation of further arrests.

"The raids, will probably go on forever," said Mongomery County Police Chief Robert J. diGrazia. "We want to get those kids so paranoid that they won't smoke marijuana outside."

DiGrazia added that since Monday his office has received dozens of phone calls from parents in support of the police action.