Purity -Crystal meth crackback patterns - any relation to. w i n n e r o f 1 8 p u l i tz e r p r i z e s. S e rv i n g t h e p u b l i c s i n c e 1 878. Obviously some patterns work better against certain defenses. I don't know what 'jump' is, but I have injected meth and coke/crack before.

Low-intensity abuse describes a user who is not psychologically addicted to the drug but uses methamphetamine on a casual basis by swallowing or snorting it. Methamphetamine abuse has three patterns: low intensity, binge, and high intensity.