Kids are kids. I started smoking when i was 14 y.o. and I bet that most of us here started under the age 18. I did it to look cool: " Look at me, I'm a Man, I smoke and I'll be obnoxious about it".
Why would it be different with kids today? If they think vaping is cooler than smoking... Is that so bad?
Allowing vaping in class though.... is another story.