Allen Carr’s EasyWay

I’m currently reading Allen Carrs book. He says not to quit until he tells you to- but has anyone quit before that point? Part way through the book I just want to throw my vape away and never look back but a part of me is saying to hold out until he says to stop so the effect works better. I’ve just been super worried about my lung health lately so I want it gone as soon as possible and have little time to read the book as of late. Any suggestions or personal experiences?