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.
verb (used with object) 1. to make healthy, whole, or sound; restore to health; free from ailment. 2. to bring to an end or conclusion, as conflicts between people or groups, usually with the strong implication of restoring former amity; settle; reconcile: They tried to heal the rift between them but were unsuccessful.