How do you use guaranteed to pass SMOG?

Could you elaborate on how one would utilize a "guaranteed to pass SMOG" service or product? Is it a physical device, a software program, or a service that ensures a vehicle passes its SMOG test? What specific steps does the process involve? How does it differ from traditional methods of preparing a car for a SMOG check? Are there any potential risks or drawbacks to using such a service? Is there any evidence to support its effectiveness in helping vehicles pass SMOG tests?