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Hi! I have a question! I just

Hi! I have a question! I just bought an oil lamp from walmart, and bought the oil lamp from the same manufacturer, I followed directions and let the wick soak for 15 minutes (that's what the box said to do) before lighting it, but the flame was HUGE and smoked like crazy. I didn't trust it so I just blew it out... I've never had an oil lamp before, and just wanted something for light if we lose power during the winter, so I'm completely inexperienced with this.. Did I do something wrong? I made sure to keep the wick short, any shorter and it would have been down in the brass part if the lamp. Any advice?