Codene

hey i have cough medicine and my unlce told me i could freeze it and scrape off the thin layer of codene....im gunna do it just homw many lines you guys think i should snort for a 15 yr old 160 pounds......

and what is the high like anyways??

You're going to do it because your uncle told you it was possible? There's much better ways to get high, don't even waste your time.

I doubt it because if you have cough medicine with codeine, the codeine is likely mixed throughout the syrup and doesn't float on top. I also wouldn't snort codeine because it has a high bioavailability anyways (when you take it orally the first pass through the liver will not result in much loss of the drug unlike with morphine).
I'd guesstimate 40-60mg of codeine as a decent dosage for somebody with no opiate tolerance and the only way to measure that dose is to look at the lable and see exactly how much codeine/ml and how many milliliters the bottle contains.

for a first timer wouldn't more like 120mg be appropriate to get a really euphoric buzz? Well what Nullific says he's right about it :), but I'd personally take 120mg to get it well going. Once you build a tolerance it can take up to 240mg to get really buzzed, but anything higher takes on bad side effects, so cherish the moments of virginity, eh?

No wait you're right hahahahaha. Man I can't feel shit wheeeeeeeeeeeee! 60mg codeine + a bowl of weed.