After having reflected on my reasons to NOT want to quit smoking, I've come up with the following:

• I'll gain weight Yes, I will become fat. This sucks. Only option is to simultaneously quit eating.
• I won't make friends as easily True / not true - will probably make friends more easily with non-smokers.
• I'll lose my security blanket Also true. However, can easily find new addiction/neuroses to replace smoking.
• I'll lose my cynical edge Whatever, I never had a cynical edge anyhow.
• What will I do with my hands? I can become one of those "pickers." Like the people that pick labels off beer bottles, and pieces of lint off sweaters, and like plucking their eyebrows a little TOO much.