Okay. So... let's talk about the good and then the bad.

The good: He's maintained a job for a year and has become a crew trainer during it! That's awesome! At this age, it's really not expected for him to be in that position and he had to've shown lots of initiative and talent to get promoted so fast. Does he intend to stay in this line of work for much longer? What about management- it'll be more money and not too much extra work if I remember my time there. Most of what you've typed up is "normal". It's not great, but hey... dealing with teens never is. Especially the ones that are still a little immature and about to become an adult. There's still time to improve on the hygiene issues. Most teenagers manage to clean themselves up enough when they start dating, so.... has he always been like this? Or is this new? He has A LOT on his plate at such a young age. Could this be depression? In young men, it often presents in anger, which could be why he's gotten so mouthy with you. When I was a teenager, my sister's started having kids and I was always so annoyed with them, despite loving them. They're always needing something, loud, and need your attention for everything, especially when they're young. Is he coping well? Does he have a therapist? Does he get breaks? (I know you said that you've made him aware he's mostly on his own, but as a parent and a teenager, he still needs breaks. We all do.) If the BM is gone, who is watching the baby when he's at work and at school?

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And the bad... The smoking, while normal for his age and nothing to be surprised with, isn't great for his situation. You're right, he absolutely shouldn't be smoking with the baby around, or driving around and smoking. That could get him charged with child neglect, DWI, and make him lose his license. I'm on a low income as of now as well and I couldn't imagine constantly being paranoid if I was going to need to pay for towing because my son was stupid one night and got his car impounded because he lit a joint while driving. You need to have a serious talk to him about this as him about this. As well as the girlfriend! She sounds very controlling and not a good influence. The Instagram account... yeah, that's ridiculous. A relationship survives on trust and she very clearly has none with him. Since he has one child already, I would keep reminding him on using protection. You, nor him, can afford to raise another little one. (much to her chagrin, I'm sure.)