With Arizona voters poised to consider pot smoking for recreational use, AAA Arizona is urging caution in light of new data linking legalization with lethality. Spokeswoman Linda Gorman says that they looked at the latest numbers from Washington State and they have seen a doubling in traffic deaths coincident with the legalization of marijuana there.

Gorman notes that it’s too soon to say if marijuana use caused this increase but she does say the data warrants more in-depth study of how pot affects your ability to drive and at what levels it would be equivalent to driving drunk.