The effects of using of e-cigarettes is stronger in adolescents than adults, experts claim.
Professor Eric Kandel, whose research suggests E-cigarettes could lead to harder drug use, said: "The effects we saw in adult mice are probably even stronger in adolescent animals.
"One drug alters the brain's circuitry in a way that enhances the effects of a subsequent drug. Therefore, we should do all we can to protect young people from the harmful effects of nicotine and the risks of progressing to illicit drugs."
More than a million people in the UK are believed to get their nicotine fix from e-cigarettes but opinion is divided about the safety of them.
The first E-cigarette dates back to 1963 in Pennsylvania when a 40-a-day smoker filed for a patent "smokeless non-tobacco cigarette".
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From the time three bodies were found at a house in Oxfordshire to when prime murder suspect Jed Allen was found dead in woodland.
Mostly cloudy overnight, but as low pressure systems feed in as the week goes on an unsettled period can be expected.
The hunt for murder suspect Jed Allen has ended after police found his body two days after discovering his mother, stepdad and sister dead.