Well, aliens would have better tecnology than us (something we could'nt even imagine!) so i would guess they would have a bunch of cool drugs, but then again, they might not, because they might not need/want drugs. But if they did im sure it would be like the "perfect drug". Ya know, has very strong affects, but would'nt have any negative effects on one's mental or phyicall state.

Ah, it'll be so cool when humans make proper contact with aliens unless its gonna be like independence day or mars attack.