One of the most popular examples is the nicotine patch, a small patch that adheres to the skin and releases small amounts of nicotine to help you manage withdrawal symptoms
and American Cancer Society
Swedens long-standing use of snus, a tobacco pouch alternative, has resulted in the lowest smoking rates among developed nations, and public health data suggests that a similar switch to smoke-free alternatives could deliver a 10-fold reduction in smoking-attributable deaths compared to traditional measures alone, according to PMIs review of smoke-free alternatives and Swedens experience
Smoking cessation drugs such as Chantix and Zyban can help you quit but can also cause uncontrollable anger, hostility, suicidal thoughts, and depressed mood (for more information, read this)
As for exactly how long, there are numerous factors at play - including the cigars vitola