Two twins with identical physiology, biochemistry, weight and height are exposed to a total of 5 mg/day of chemically identical airborne particulate matter (PM), containing PAHs and heavy metals. This exposure occurs for 2 years. Twin A is predominantly exposed to PM10 while Twin B is predominantly exposed to PM2.5. Both twins will experience identical chronic toxicity because both had the same total dose - True of False.

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Substance Abuse

Substance abuse refers to the use of illegal drugs in excessive quantities, as well as the misuse of legal substances such as prescription or over-the-counter pharmaceuticals or alcohol for purposes other than those intended. Drug addiction, also known as substance use disorder, is a disease that affects the brain and behavior of a person. It leads to a failure to control the use of any drug or prescription, legal or illegal.