How does diluting cough syrup with soda turn it into a powerful drug?
Kids always think that they're the 1st to discover something, but this isn't a new concept. When I was in college 20(cough5) years ago, I knew a couple of kids that would get a codiene high by drinking cough syrup. They called it "going Rob-ing" (with a long 'o'). Apparently it was a good, cheap, and legal high, but the aftereffects (constipation from the codiene) were unpleasant.
They’re just taking an extraordinarily large dose of cough syrup...and using the supersweet drink and candy to make it palatable.
The high comes from slamming the entire bottle of syrup, the sode is so you can it get down cuz it taste's nasty. As noted above, I remember back in college kids were doing this, it's nothing new.