I wouldn't necessarily
vape around little kids for a variety of reasons, but it's not going to hurt them if you do and there is absolutely zero chance they'd get a "buzz". How can I say that? There has been testing of vapor. Test results show the vapor consists almost entirely of water. What wasn't water was a few trace elements of chemicals not known to be harmful and they were at nearly undetectable levels. The nicotine level was 0.01%. 1/100th of one percent. At that rate, you couldn't pack enough vapers in a poorly ventilated room to generate harmful levels of nicotine.
This was confirmed, in my mind anyway, by blood and tissue test results on my parrot, who sits within 8 feet of where I chain
vape all day. Birds are extremely susceptible to airborne toxins. They accumulate them in their bodies to a far greater degree than any other animal. That's why they used to use canaries in coal mines. After almost 2 years of exposure to my vapor, my parrot had no detectable level of nicotine in her blood or tissues. I paid a lot of money extra to have that thoroughly checked. OTOH, she did have traces of airborne pollution and heavy metals, undoubtedly from the air in the lightly traveled suburban neighborhood where I live.
Bottom line, there is more risk from the air you breathe in a typical neighborhood than there is in exhaled vapor.