Unfortunately, that means most people in both groups failed to quit.
Lead researcher Dr. Nicola Lindson-Hawley theorized that having to plan out a nicotine schedule was more harmful than helpful, saying "it provided them with an extra thing to do, which may have put them off quitting altogether."
But the study admits going from a heavy tobacco user to smoke-free overnight isn’t the best option for everyone.
Dr. Lindson-Hawley said: "Many people cannot imagine being able to stop completely. For these people, it is much better to attempt to cut down their smoking than do nothing at all."
This video includes a clip from University of Oxford.