"He didn't think there was anything wrong," Kennedy said. "He told me that almost all classics did."
And she soon realized that the trend had reached many more children in her round: Kennedy, who owns a dance studio in Northern California, found that most of her dancers had been trying to arm too. She learned that children were gossiping in school, pushing inside their shirts and in some cases loading their e-cigarettes into their teacher's own computer, she said.
Meanwhile, many parents seemed unaware.
Health experts say that parents whose children often use weapons do not know what to do or where to turn to.
"It's over social media," Kennedy said, and popular with star-gatherers in her community.
As a mother said Kennedy, she understands the role peer press can play with fads like e-cigarettes. And like a sportsman – Ryder is an avid football and basketball player – Kennedy said she knew she had to do something. So she asked a local company to print some T-shirts with a simple message: "Athletes don't." She didn't know it would happen.
"The children's response was what blew me," Kennedy said.
Aussem first tells overwhelmed parents, "take a deep breath".
"An important conversation
"I kept the window open," Berkman said, a mother of four in New York. "I realized this was going on in my house."
For many parents, she said, it is important to understand that there is no quick fix.
What is important, said Aussem, "is to really think about," how should I intervene and really be willing to see this as a journey? ""