I agree with the previous poster. White smoke on cold starts is typical because of water condensation in the fuel system. Typically, as you drive, the cats heat up and evaporate the water and the white spoke goes away after driving for 10 minutes.
Since you're catless, I would think that it would take much longer wait to get the exhaust hot enough to create evaporation, no?
If you get white smoke after driving for an hour, you probably are burning anti-freeze and will need to take it to the shop for repairs.
Check underneath the oil cap...if you see a light capuchino-like or mustard colored buildup, that means that the anti-freeze is mixing with your oil.
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