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I just wanted to give a little information about the physics of air moving around a moving boat.
As you can see from the diagram below, what happens on a boat depends upon the nature of the boat. If it is a typical large dive boat with a solid front, as it moves along the air moving air will wrap around it and blow back into the boat. If someone is smoking at the back of the boat, the smoke will drift back into the boat with it. If, on the other hand, it is a small open boat without an obstacle in the front, the smoke will drift off the back.
View attachment 151258
This is the same reason the back window of your SUV gets dirty on dusty roads and wet when it's raining.
I can see this logic. This would mean that it's OK to smoke at the rear of certain boats, but not others, no?