Seven 11th-grade students felt nauseous and dizzy after using e-cigarettes in their classroom in the northern Vietnamese province of Quang Ninh, the Vietnam News Agency quoted local authorities as saying on Monday.
The teen girls brought the e-cigarettes from outside into Yen Hung High School in Quang Yen Town, Quang Ninh and used them before lessons began on Monday morning.
As the side effects started shortly after, the students were taken to the local medical station for a check-up.
After having their health checked, giving samples for drug tests, and resting, the teen girls returned to a stable health condition and were allowed to go home on Monday afternoon.
Test samples taken from the seven female students were all negative for drugs and stimulants, according to police in Quang Yen Town.
Police officers are investigating the case.
In Vietnam, although the smoking of e-cigarettes is forbidden at schools, a number of students are still interested in using them as a new experience and style.
Experts have called on the Vietnamese government to enforce a stronger policy to prevent the use of e-cigarettes among the youth.
The rate of e-cigarette smokers in the 13-17 age group is 2.6 percent, while that in the 15-24 bracket is 7.3 percent, according to the Vietnam News Agency.
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