My dad VS My dad's friend?

Okay so my dad, well, he drinks. He isn't abusive. He's genuinely a good guy, but I hate that he drinks. He's constantly getting drunk and it's embarrassing. I'm 14 now and frankly, I'm sick of it. I mean most of his friends drink, but it's to an extent. I've tried to tell him how i feel and how he is really damaging his health because he's also a heavy smoker. However, he doesn't seem to care and to be honest the only time he acts like he cares about me and likes me is when he's drunk. So, anyway, he has this friend who doesn't drink. We talk and hang out a lot. I just, I feel like I can rely on him more. I feel safer because I know that because of him I'm not alone. He's always there to be the designated driver or responsible one in the group. Both of us will sit there and just have a conversation while every one else is getting drunk. He's always looking out for me and tries to include me in as much as he can. We do almost everything together. He brings his kid with my dad and me and we just.... live. I feel like I can be myself around him. Not like an adult (which i have been acting like since i was in the 4th grade). I can act as childish as i want and laugh as much as I want without having to worry. However, I feel like this is the way i should feel with my dad. Is the friendship between my dad's friend and I healthy? Or should I drop him for my actual dad and keep trying to have him think about his health more?