I would highly recommend that you don't try shooting or snorting novacaine. Local anesthetics readily cross the blood brain barrier with the primary pharmacological action being CNS depression. At low therapeutic blood levels there are no CNS effects of any significance, but at higher levels the primary clinical manifestation is a generalized tonic-clonic convulsive episode. Between these two extremes exists a spectrum of other clinical symptons which hardly define recreation. These include a warm flushed feeling of the skin, generalized light headedness, dizziness, tinnitus, drowsiness, and disorientation. My advice would be to try something else.