How many subjects are included in the experiment?

Refer to the following table. The table summarizes results from an experiment in which subjects were first classified as smokers or nonsmokers, then they were given a treatment, then later they were again classified as smokers or nonsmokers (based on data from Pfizer Pharmaceuticals in clinical trials of Chantix).

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Before Treatment Smoke Don't Smoke Smoke 460 4 After treatment Don't smoke 361 192