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I disagree with the statement that "a drug is a substance which brings about mental, emotional, behavioral and physiological changes to a person." This definition is overly broad and does not accurately capture the specific characteristics of drugs.
Drugs are substances that have pharmacological effects on the body, which can indeed include mental, emotional, behavioral, and physiological changes. However, not all substances that cause these changes are considered drugs. For example, caffeine and alcohol can cause these effects but are not always categorized as drugs in a medical or legal sense.
Moreover, the term "drug" often implies a substance that is used for medicinal or recreational purposes, which distinguishes it from other substances that may also cause changes in mental and physiological states.
Therefore, while many drugs do bring about the changes described, the definition of a drug is more precise and should consider the intended use, pharmacological properties, and legal classification of the substance in question.