For example, would Celestial Poisons allow an Alchemist to create drugs that work on Evil Outsiders or Zombies?
Can they combine two Drugs to gain an increased effect?
Increase the DC/Duration of a Drug?
Convert a drug from one form (contact/inhaled/injury) to another?
Make Drug coated weapons last longer?
Do they gain an increase to their saving throws against drug addiction like they do against poisons?
Can they not get themselves with the drug when applying it to a weapon?
Can they apply it as a Swift or Immediate Action to weapons?
etc?