I have two examples: I used to do that and that hurts. That's a good I-used-to. It's a reminder. So the person actually wants to protect you.
But exhibit B: I used to do that and it was a waste of time. And saying that when you're feeling good, was just a selfish statement. YOU did that. YOU lived that way. YOU got to experience that. Why not I? Hey maybe I'll be better than you. Maybe my time will amount to something. Then you'd wished that you didn't stop. And hey, my life is not your life. We're not the same. What makes you think you're better off? Just because you stopped doing or thinking or behaving a certain way, does it make you a better human being? Just because Hugh Hefner saved Hollywood sign, does it mean that the Playboy bunny should hop on the Wood?
I get it, feeling you're better off. Feeling that you're more mature and experienced and whatnot. But please respect that I have a life too. And it's rockin good. So just because you stalled, doesn't mean that I will.