Drug refers to any substance, other than food, capable of altering our physical and mental functions, including psychoactive substances which can affect our central nervous system and some familiar substances like alcohol and tobacco. So the word “substances” is more often used than “drugs”. Due to the need of medicine and social life, substances(drugs) are pervasive from aspirin to wine or coffee. We need pay attention to the misuse of substances, for drug overdose and repeat use of a drug can harm us.

Thanks for your correction.( ^_^ )