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Blue smoke=burned oil
If it's a puff at start up, most likely, you only ran the car for a very short time the last time it was started.
If it's more than just a puff, the next most common culprit is the AOS. You can check this by unscrewing your oil cap while the car is running. If it's really hard to get off, there's more vacuum in the crank case than there should be and the AOS needs replacement.
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