If I am understanding you correctly, you are asking those that do vape, to supply you with reasons not to do so.
Why do you think you shouldn't vape?
When I was a smoker, I never encouraged anyone to smoke, if I found out a younger person had recently started I would tell them my experience of becoming so addicted I could not find a way to quit. They already know the health warnings, as they are printed right on the pack of cigarettes, as well as being taught in schools about it's effects. I would hope they they never start, but if they did, and subsequently became addicted, I also didn't judge them.
I don't like the taste of alcohol, but I don't judge others that do, I don't gasp at a party if someone is drinking a beer, and spout off all the dangers of alcoholism. I also drink tea/coffee, but don't give lectures about the effects of caffeine when I see someone have their first caffeine drink. I also can't fathom why anyone would drink an energy drink since I think they taste horrible, but many do...some even mix them with alcohol and put two horrible tasting things together ( can u imagine?) lol.
I don't do any type of illegal drugs, not from a moral standpoint, but because I don't care to not feel in control of my senses, and I can be drug tested at work randomly. As long as people remain responsible I don't judge those that do use them. I don't rely on them to convince me not to, I found my own reasons. Obviously if the substance takes control over their lives to the extent that they can't function, that is a concern, but I'm also aware that this also happens from gambling, or shopping compulsively. So not all self harming behavior comes from the use of drugs, illegal or legal.
I also don't expect my government to "protect" me. I would like to make my own decisions, I do expect the government to make sure we have access to proper info to make decisions. But I am also aware that the government can be influenced by corporate dollars either for, or against and point of view. Its a complicated world we live in, and it can be hard to always make the best choice for ourselves, but even so, my neighbors trying to force me to use, or not use any product is not the answer I am going to rely on.
If you really feel compelled to try something because it has sparkly items , you might want to lok within yourself and find the answers why. We can't find those answers for you, we can only speculate on them. If you are looking to this community to educate you about vaping so you can make an educated decision...then you'll find that here. But the decision is always going ot be yours to make, at least I hope it remains yours to make, and I hope you make the best one for you.