DE-MANIFESTATION LIFE MEDITATION.

To "de-manifest" something, simply use the manifestation meditation and once you get to "I witness the maturity of [my perfect health—poor example here—changing to "smoking habit"]" skip the invocation and keep moving on to:

I witness the old-age of my smoking habit
picture the pale skin, leathery, wrinkled, dying, brittle frame

I witness the death of my smoking habit
on its death bed, saying goodbye

I witness the funeral of my smoking habit
picture someone saying some nice words "Ah, smokey... got me through some hard times"

I witness the cremation of my smoking habit
you could say "burial" here. Though cremation doesn't give it a body to come back and haunt.

. . .

This process allows you to accept what is, and even appreciate it for what it has done, then observe it dying.

It would be a good idea to have a desire that you do want to manifest ready to go when you de-manifest something. That way you there's not a big gaping hole.