Chances that he will go back to the drug??

by Brittani
(Melbourne, Florida)

My daughters father was addicted to meth for quite a long time. He has some obvious signs that he used. He never went through any kind of treatment. He quit cold turkey by himself. When he's talked about it to me he gets a longing look in his face like he misses it.

What are the chances he will go back to using meth or any other drug?