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The 24-hour timeline showing that the dark cycle began at 2:00 PM and ended at 2:00 AM. From 10:00 AM to 4:00 PM, the smoke-exposed animals were exposed to smoke (the * indicates that the control animals were not subjected to smoke during this time). Immediately after the smoke exposure period, both groups had free access to alcohol starting 2 hours into the dark cycle beginning at 4:00 PM and ending at 6:00 PM.
