Question: I know that this film was set in the 1990s but even then, was smoking permitted on US submarines? It would seem a bit odd given that the crew are relying on recycled oxygen.
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Answer: In the most technical sense ("by the book") it is against policy. But then, the Marines do not allow tattoos and look how well that's enforced. It is up to the ship's Captain to enforce such regulations, and at sea, there's no one to penalize him if he chooses to let the crew smoke at certain times, given certain conditions.
johnrosa