Smoking is a big business. A recent study estimated that worldwide the industry made over $8.3 billion in 2005, the most recent year for which data is available. There are many products available to help smokers quit, but don't always know which ones work. When a new product is introduced, I will try to offer a brief description of its advantages and disadvantages. This page will also contain links to a full, in-depth review and comparison of these products. (See our full list of the most popular tobacco products.) How do I know if a product works for me? There are several ways to measure success in quitting. The most popular way is with the quit rate: the percentage of people who quit after using the product. This is the percent of people who successfully completed an attempt to quit smoking, and for whom there was a success rate of at least 75 percent or better. The most popular quit rate comes from the Quitline Program. It is a simple phone call in the US and Canada. There are numerous methods of success: phone, web chat, in-person, and online chat. Are there other ways to quit? It depends on how well you know yourself, and how well you have worked with others in the past.