The term substance, when discussed in the context of substance abuse and dependence, refers to medications, drugs of abuse, and toxins. These substances have an intoxicating effect, desired by the user, which can have either stimulating (speeding up) or depressive/sedating (slowing down) effects on the body.
Definition of heal. 1  transitive verb. 2  1a : to make free from injury or disease : to make sound or whole heal a woundb : to make well again : to restore to health heal the sick.
convalescence - gradual healing (through rest) after sickness or injury. recuperation, recovery. healing - the natural process by which the body repairs itself. lysis - recuperation in which the symptoms of an acute disease gradually subside. rally - a marked recovery of strength or spirits during an illness.