More on Smoking and Birthing...

In your case I believe your smoking is related to the rebirthers assumptions about filling/expelling from the lungs and birth trauma. You have even answered it through your own response!

I believe you are reliving a different aspect of the birthing experience which is the need to exhale/expell the amniotic fluid in order to live!

Here is your own quote...

"If I don't do it, I can easily lose interest in breathing in fully, which to me is synonomous with being alive".