Have you ever been successful at convincing someone to stop doing something bad?

My friend bought a vape randomly. He has no previous history of smoking and simply wanted to try it out. As he was vaping, he kept saying stupid stuff like, "I can really see myself getting into this" and "This is actually really addictive!" probably trying to sound cool, I guess? but I ended up convincing him to stop after a few minutes of listening to him act like he's addicted to coke.