Would you believe a guy if they said they'd stop smoking weed for you?

The question is in the title.. but here is a bit of detail.

I was hanging out with my guy friend of about 9 months last week and I heard him on the phone talking about 1/8 of something and paying the person back. I wasn’t bothered at first, he’s 23 years old and he can do whatever he wants. I like him though, so my mind began to wonder and I just want him to be safe. I texted and asked. He said it was about shrooms, but he hasn’t done them yet.

I was infuriated, but have cooled down since Saturday. I didn’t reply and received 9 messages between then and last night asking if I was alright, please respond and did I think any less of him. He texted me while he was at work, and I was in class this morning asking for me again, if I was alright and he was “so very sorry”. I said something back and it some messages are as follows:

1. I don’t know what I want you to say, but I want to listen and hear you out. I want to know things between us are ok, and if not I want to know what I can do to make them ok.
2. Im really sorry. I didn’t mean to hurt you. I just wanted to be 100% honest, I know I made a mistake here. I don’t want to lose a friend over this. I care about you a lot. I’d rather save our friendship than continue doing that stuff. I mean I’ve been texting you like crazy about this, you’ve got to believe me when I say this. Please forgive me and give me a chance to fix it.
3. You’re right, I don’t want to lose you. Me and my friends do other things besides smoke. I’ve always anted to a good reason to quit, so why not now.

It sounds like through some of this that he likes me more than a friend? I’ve known him since summer. We see e/o twice a week at school and he’s been asking me to hang out more lately. He says whatever you want to do is fine with me, all the time. Constantly there for me, helps with homework, courteous, etc. He’s a nice guy, so it’s hard to tell?

He admitted that he smoked everyday during his senior year of college, quit for 2 quarters and just started up again. I mean, he’s smart, and has 2 jobs, and is finishing requirements for medical school. As am I. I just don’t know what to say. I have never been at a loss for words like this.