what's that song when they're smoking pot together?

The song is called "What Else is There?", by the group Röyksopp. You can get it on iTunes here:

http://itunes.apple.com/us/album/what-else-is-there/id79279457?i=79279346

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And remember: no matter where you go, there you are.

It's really good! I put it on my iPod after seeing it in the film. Worked so well in that scene.