What will happen if one turns self into doc or hospital for cocaine problem?

[an_army_of_one]

A friend of mine is addicted to coke. They want to stop but they don't want to check into a rehab place or are unsure of how they want to quit. But what they do know is that they don't want to do any life changing drastic decisions for a couple of weeks because they want to finish the school semester.

If they tell a psychiatrist about their addiction, does the doctor have the legal right to force the person into some kind of treatment immediately? Or can they let the person wait a couple of weeks while still taking the drug with the idea that in January they will be able to enter a rehabilitation facility or some other kind of treatment?

From what I can tell they try to be as safe as they can technically be with an illegal drug like Coke so I don't think that they might die or od of some kind of thing in the next month.

Thanks!

also this takes place in Arizona USA incase there are different laws in different states/countries.