Joesi |
Drugs in Pathfinder are significantly exploitable. Before a GM allows use of them I'd recommend implementing some house rules (These rules should really be implemented by Paizo for the game too though):
1. Drugs cannot be weaponized like poisons
2. Anything immune to poison are immune to drugs as well
Even then there might be some other problems still around, but those two are the main ones.
I don't see anything particularly problematic about using Beguiling Gift with drugs though, since that's the whole conceptual intent of the spell.