Substance abuse refers to the harmful or hazardous use of psychoactive substances such as alcohol, tobacco, prescription medicines, or illicit drugs in a manner that leads to physical, mental, social, or economic damage. In community health nursing, substance abuse is understood as a pattern of consumption that deviates from medical or social norms and results in adverse consequences for the individual and society. It includes repeated use despite awareness of its negative effects, leading to deterioration in health, family relationships, occupational performance, and overall quality of life. Substance abuse is not limited to illegal drugs; even legally available substances can be abused when used excessively or inappropriately. It is considered a major public health problem due to its association with accidents, violence, mental disorders, and transmission of diseases. Tolerance is a physiological and psychological condition in which a person requires progressively larger doses of a substance to achieve the same