TOPEKA, Kan. (AP) -- It will soon be illegal in Kansas to possess or sell two chemicals used to turn herbs into synthetic marijuana.

Gov. Mark Parkinson signed a bill Wednesday outlawing the chemicals that are key ingredients in altered herbs that are sometimes known as "K2" or "Spice." The new law takes effect March 18.

The measure also outlaws two other chemicals used for a new form of the illegal, euphoria-inducing drug Ecstasy.

The chemicals used in "K2" or "Spice" are sprayed or sprinkled as a powder on herbs, so they can be smoked and produce a pot-like high.

Law enforcement officials in northeast Kansas have said they began seeing people using the synthetic marijuana last summer. Missouri legislators also are considering a ban.