• Yes, in a way. Caffeine is a diuretic ( as is booze), it dehydrates you. It's been shown that dehydration can increase the chance of sustaining a DCS hit ( decompression sickness). Always dive hydrated and bring bottled water with you. The air in a tank has been dehumidified at the filling station and every breath you exhale, litterally, takes a lot out of you.

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