A counter example: If I was a pack-a-day smoker and tell you smoking is bad for you, and that you shouldn't do it as it's bad for your health based off XYZ stud

A counter example: If I was a pack-a-day smoker and tell you smoking is bad for you, and that you shouldn't do it as it's bad for your health based off XYZ studies, that doesn't mean my statement is poor.