What can I expect after having smoked weed and failing my drug test? General or dishonorable discharge?

I can speculate that you will receive an OTH. However, that is speculation. And that is all that anyone here on RP can tell you. Granted, our speculations are based on years of experience. That being said, your Commander has the ability to recommend what type you get from OTH up to Honorable (don't expect this one) because anything worse than an OTH is given via Courts Martial. The approving authority with take the recommendation of your Commander and make a final decision of their own. May the odds be ever in your favor.

How bad do you want in or out of the military? How bad to you want to stay in? Have you had a heart to heart with your Commander about options? Fix this if possible before separating.

What did you end up getting?

Hope for the best and prepare for the worst. Is it possible to be discharged? Absolutely (you’re looking at general or OTH) but it’s quite possible to be retained. You should be command referred to ASAP, but if you’re not go self enroll into it. Show that you’re willing to get help and still work hard as an asset to the team. I have seen many Soldiers stay in for failing a drug test, but it’s all about willingness to learn from your mistake and continuation to work that will set you apart. Also as someone stated, talk to TDS.