OMG bro, you like, don't know what the fvck you're talking about!
The misuse of any psychostimulant has the potential to induce permanent psychosis, depression, Tourette-like symptoms, and schizophrenia due to manner in which XR, dextroamphetamine and others interact with dopamine/serotonin receptors and receptor sub-types. The fact is, anybody recreationally using Adderall/Dexadrine/Ridalin is adversely affecting their brain's ability for norepinephrine, dopaminergic, and serotonergic synthesis and transmission; these classifications of amphetamine derivatives and salts block dopaminergic reuptake for the most part, an incredibly adverse condition to be in if not needed.
Without a need for Adderall/Ritalin/Dexadrine, you are overdosing. Period. In fact, the misuse of any of these RX medications may cause degradations of neurons in the PFC - not necessarily something you want to induce.
The inhibited reuptake of serotonin, and imbalance in dopaminergic synthesis, and transport induced by XR/R/DX misuse can easily produce disassociative and hallucinogenic states, as well as 'tics' as they are known by TS sufferers.