This is called “Vaping”. The vapor is very similar to smoke, but it’s only water vapor.  You get the same feel as if you are actually smoking, , a real throat hit, you still are putting a device in your mouth like a cigarette and you are even blowing smoke, known as vapor, out of your mouth like a cigarette and you get your “fix”, just like a real one.
There has been little high-quality research into the use of cannabidiol for epilepsy. The limited available evidence primarily focuses on refractory epilepsy in children.[15] While the results of using medical-grade cannabidiol in combination with conventional medication shows some promise, they did not lead to seizures being eliminated, and were associated with some minor adverse effects.[15]
They’re just saying if you haven’t already been introduced to nicotine, why start? Nicotine is a habit forming drug and vaping has Nicotine in it’s Vape juices… but if you intend on Vaping @ 0% Nicotine, then you are Right, it wouldn’t be a problem… but sometimes temptation for kids in school for instance, Vaping for leads to adding that nicotine to the equation… cannabidiol