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Repeated amphetamine use, including Adderall, leads to psychological dependence, as users quickly build tolerance, requiring higher doses to achieve the same effects, which significantly increases addiction risk according to Knapp (1952) in the study Amphetamine and Addiction. The signs of Adderall addiction include increasing doses without medical guidance, obsessive thoughts about the drug, and difficulty reducing use despite personal, social, or physical harm

Testing for multicollinearity also revealed no collinearity of the variables (the average VIF was 1.7, the lowest was 1.0, and the highest was 7.3)

More than 4,000 chemicals have been identified in tobacco smoke, and hundreds of them are toxic

& Neas, B