It's not likely you'll have a full-blown LD the FIRST TIME you take calea zacatechichi, as a result of the calea zacatechichi.
Why?
Because there are so many factors involved in having a lucid dream, not to mention getting the dosage right for YOU and having the correct mindset.
Even with Salvia Divinorum which CAN instantly blast you into a lucid dream (even while awake,) getting results the FIRST TIME and EVERY TIME is not likely for very many people.
To understand this, you first need to understand what's going on chemically and neurologically when you are awake, asleep, dreaming, and lucid dreaming. I'm not going to go into all the details in this thread, because I did so a year ago in GREAT length and you can always go back in the archives and find several posts about this.
But suffice it to say that calea zacatechichi only partially sets the stage for full consciousness and clarity. Your brain has to do it's part, and no drug that I know of will give you instant and guaranteed lucid dreams every time.
In closing, Calea Zacatechich takes a lot of the work out of having lucid dreams, but it's not "lucid dreaming in a can." For example, skydiving is a lot easier when someone else packs your chute, suits you up, takes you to the plane, and kicks your butt out the window. That's sort of what C.Z. does. It sets everything up for you, but you STILL have to 'pull the ripcord' so to speak.
If you have no experience with lucid dreaming, your chances of getting lucid with calea z. are 25-50%. If you are experienced already, or at least have worked on recall, etc, then your chances are 50% or better.
Someone correct me if I'm wrong about this, but that's my take. Oh, by the way, I did have 3 lucid dreams the first night I tried the stuff, but I have 1 lucid dream every night regardless of what I do, so I don't think I'm a good scientific subject.