Of course not. Dip is the one of the most disgusting things in the world. In fact, in my top 10 list of the least desirable things a girl can do, dip topped out at #1. Let's spare the gums of people not mature enough not to know not to do it.
I think thick mascara and chocolate yogurt are disgusting and unattractive too, but I'm not going to ban them
If mascara is found to cause cancer, then yes, let's ban it for under 18's.
soap, deodorant, hair spray, Johnson's Baby Shampoo, talcum powder, and hot dogs all contain carcinogens. should their consumption by under 18s be banned?
Ok, if soap is found to cause cancer at the same rate as cigarettes, than yes, ban it.
And why draw the line directly at that point? Why can't we ban everything that could be remotely dangerous?
After all, it's for the kids' own good.