>>> rob vaughn: the ?s surgeon general is calling vaping an epidemic among adolescents.
>> wendy davis: and according to stanford university researchers, most kids don't realize the serious health risks they're facing.
Wfmz's julia rose joins us live now with details on those findings.
>>>julia rose: more than ?poin?6 million teens in the ?s used ?cigarettes last year, 2?percent of high school seniors vaped in the past month?and many believe ?cigs are healthier than other nicotine products.
>>reporter: christian hernandez knows you probably don't approve of his juul habit?
That's the popular ?cigarette that delivers a hefty dose of nicotine in ki?friendly flavors.
However, christian isn't concerned?
Even after hearing the warnings.
>>nats "you have an increase of heart disease and stroke."
>>christian hernandez: "if i think about other things i could put in my body, i'd rather have just nicotine and or juul then everything else."
>>reporter: and that behavior is why stanford university developmental psychologist bonnie halper?felsher worries teens don't fully understand the true harm of juul.
>>bonnie halper?felsher: "this has about 41, 42 milligrams of nicotine per pod.
So that's equivalent to one to two packs of cigarettes."
>>reporter: according to a new study by halper?
Adolescents who use juul do so more often than those who use other vaping devices.
>>bonnie halper?felsher: "we also found that adolescents and young adults who were using juuls reported being more addicted."
>>reporter: junior who wishes not to have his face shown, felt the effects of juul quickly.
>>junior: "i got lightheaded at first.
I just didn't know what to do with myself for a cool minute or so, and then i just kept on taking more hits."
>>christian hernandez: "my parents don't really know what it is.
They just think it's a flash drive."
>>reporter: halper?felsher isn't convinced that restricting sale will make a difference.
She's trying to reach kids before they start with a prevention toolkit.
>>bonnie halper?felsher: "we have reached over a hundred seventy thousand youths throughout the country."
>>reporter: an impressive number but christian warns... >>christian hernandez: "i don't see myself quitting vaping."
>>> julia rose: while juul maintains that its products are meant for adults only?
Stanford researchers say they found a lan?