How do i help him?

So my husband is going to quit smoking cold turkey! I’m so happy because it’s something I’ve been wanting him to stop doing but never pushed him to do it. Today out of no where he said he wants to quit smoking. He was explaining that he may be irritable & have thin patience going through withdrawals. My question is, how do I help him? What can I do? I want to support him as much as I can through this.