Has anyone read nicotine explained?

What the title says.

I’ve listened to easy way three times through. And I credit it with any success I’ve had.

However, the one thing that continues to bother me is Allen Carr’s assertion that nicotine does absolutely nothing for you and his refusal to discuss how it actually functions and your bodies response.

I understand the reasoning being that it does nothing positive and all perceived benefits are only the relief from withdrawal. But would like to better understand the addiction component.

Wondering if anyone has given it a read and if so, if they found it helpful.