Can Dark Smog be used during your opponent's turn?

I'm deciding whether or not I should buy Dark smog for my Dark World deck but I want to know if the effect can be used during your opponent's turn. Because it's a Trap Card and also Continuous I would think you can but it says, "Once per turn" So can you use it during your opponent's turn... show more I'm deciding whether or not I should buy Dark smog for my Dark World deck but I want to know if the effect can be used during your opponent's turn. Because it's a Trap Card and also Continuous I would think you can but it says, "Once per turn" So can you use it during your opponent's turn or only your own turn?
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