Narco Polo
Your friend who goes to the Far East and comes back wearing silk and addicted to a drug you've never heard of.

Whereas Marco Polo brought pasta from China to Europe, this douchebag just brings werid pipes he claims form part of the local custom, but where in fact sold to him by locals playing him for the fool he is.

Probably converted to Buddhism to his gap year but doesn't understand it at all.
Yann: "Payton's back from his gap year in Southeast Asia. He's been wearing silk and smoking some weird powder."
Tyson: “Oh good. Narco Polo has returned.”