Would a smoking cessation script delivered to the deep subconscious via channeling be more effective than one delivered to the client directly while they are in an ordinary hypnotic trance state, and if so, why?

Such a script will be more effective delivered to the deep subconscious than to the upper subconscious layer via the awareness of the person interacting directly with a hypnotist during a one-on-one session. This is because the deep subconscious has the greatest reach, the strongest hold on things, and will be the last part of the mind to let go of a bad habit. So it will be more powerful to address the deep subconscious than the upper levels. This will not be as effective as Holographic Memory Resolution, and the reason is that it leaves the healing up to the subconscious indirectly, whereas the HMR process invites the subconscious to carry out a purposeful healing. And if it agrees and cooperates and finds a solution and uses the energetic self-administered color imagery process, this will change the energetic signature associated with the undesired habit and will alter the inner programming accordingly, and will, therefore, be much more effective than a series of positive suggestions to stop the habit behavior.