also, looking for advice on salvia...?
hit it long, hit it hard, hold it until you feel like you're going to die and then some, and enjoy the ride.
w/r/t "spice," it's plant matter sprayed with synthetic cannabinoids (JWH-018 being the most common). I've tried some, I believe it was called Cloud 9, it was surprisingly like actual weed, but only lasted about 45 minutes. Other friends have reported less favorable experiences with K2.