Because somebody just died, and it made headlines.
So? Not to be crass but people die all the time without causing media uproars. And teenagers, being mostly incredibly stupid, do stupid things and sometimes die as a result. That's sad, but again, why the uproar just now?
And 'banning' something is usually wrongheaded an ineffectual. All a legal ban will do will be to drive the practice underground making it even more dangerous.
All potnetially harmful products are banned. Full stop!
Alcohol? Tobacco? Cleaning fluid? Glue? What about the insidious threat of dihydrogen monoxide (if you get it in your lungs you die!)