Hmm …

… Study Philosophy to Improve Thinking—A Case of False Advertising? 

I think it depends on the kind of philosophy being taught. I had two years of philosophy courses — logic, metaphysics, rational psychology, existentialism, aesthetics, and the history of philosophy  (the text was Copleston, the course took two years). I also studied under an outstanding professor — Edward Gannon, S.J., for whom philosophy was practice, not just logic-chopping and idle speculation. So for me the study of philosophy has proved invaluable