Queensland teachers and parents are concerned students are trading highly addictive flavoured e-cigarettes.
The Puff Bar e-cigarettes contain 5 per cent, or 50 milligrams, of nicotine, allegedly the equivalent of two-and-a-half packs of cigarettes.
It is illegal to possess nicotine e-cigarettes without a prescription in Queensland and Lung Foundation Australia says the devices can affect learning, memory and impulse control.