Answer :
Answer: Reinforcement
Explanation: Reinforcement could simply be defined as a process of establishing or strengthening a certain pattern of belief or behavior.
People take substances for different reason such pleasure, stress reduction or increased energy, consequently, these substances could reduce stress, boost energy, reduce psychological fatigue and so on. However, due to initial dividends derived from the use of these substances, such individual may find it difficult to abstain even when the need for those substances are not necessary due to the subconscious effect of the substance on such individual. The substance establishes and strengthens a pattern of behavior in such individual resulting in continuous use or intake.