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Honestly, you don't want to replace smoking with a similar act, although you can certainly find a temporary alternative to smoking that will help fight the addiction. Using thing such as carrot sticks or pencils as if you were smoking them, will help with the hand to mouth urge smokers have.
However, you can permanently replace smoking with something that has nothing to do with it, like running, bike riding, or fishing. Becoming smoke-free is a life changing experience, why not change other things in your life to promote your new healthy lifestyle?