What color is the smoke? Valve stem seals leave a dark blue cloud because oil is buring off. If it is valve stem seals it should do it on almost every start up where the car has been sitting for a few hours.

If it smells like gas I can't help you I am not sure what would cause that. Maye sitting for a long time?

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2016 Corvette Stingray 2LT
1969 280SE
2023 Ram 1500
2007 Tiara 3200