Designed as a nicotine-free quit aid, Zyban helps lessen the craving to smoke, offering an effective option for those committed to quitting. Its action on brain chemistry reduces nicotine's appeal, but it's important to seek medical advice to ensure safe and effective use, particularly if used with other quit aids. How Zyban reduces the urge to smoke isn't entirely clear, but it appears to make nicotine less rewarding and reduces interest in smoking.