Why does panic attack occur after codeine or Marijuana?

Hello doctor,

I am a 22-year-old healthy male. Yesterday I had my first panic attack and it was severe and lasted long. I have ended up in the emergency room. But they just gave me a Diazepam and I was feeling good again, but they never told me what triggered and I am curious. Last night I drank 110 mg of phosphate codeine (liquid) and drank one 600 ml beer and then smoked Marijuana. Once I get back home which was a couple of hours later, right after I smoked the panic attack started. But I am smoking for six years and just strong strains and concentrated and nothing ever happened before (yesterday I smoked a really non-potent one). My question is, is it possible that the weed is causing the panic attack or it was the codeine with beers? I really do not want that to happen again.