What can high doses of stimulants cause?

(METHAMPHETAMINE, COCAINE, ECSTASY AND PRESCRIPTION STIMULANTS LIKE Ritalin) ARE DANGEROUS BECAUSE THEY CAN CAUSE STROKES, SEIZURES, HEART ATTACKS, OR EVEN DEATH x_x. OVER TIME, PEOPLE WHO TAKE STIMULANTS THAT WEREN'T PRESCRIBED FOR THEM CAN OFTEN SUFFER FROM MALNUTRITION AND BECOME PARANOID.