JACKSON - Synthetic marijuana is now illegal in Mississippi.

Gov. Haley Barbour on Friday signed a bill immediately banning the sale and possession of the herbal mixture known by names such as Spice, K2, Demon, Voodoo, Genie and Zohai.

Retailers can''t sell the products, but they have until Oct. 1 to return them to distributors or turn them over to law officers.

Barbour also signed a multimillion dollar incentive package for a Texas-based biofuels company, KiOR, to develop factories in Mississippi to convert timber products into a crude oil substitute.

He also signed local bills for DeSoto County and D''Iberville. Lawmakers passed all the measures during an Aug. 27 special session.