If this is a new furnace installation then it is normal for it to put out a large volumn of smoke. As long as this stops after a few mins. it's nothing to worry about as it is just a coating of oil they sprayed the heat exchanger with to protect it till installation.
I know the first furnace I installed thirty years ago about gave me heart failure when I turned it on and literally filled the house with smoke. Best of luck and thank you.
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