Check the vacuum modulator unit on the transmission and line from the transmission to the intake. Once the rubber diaphragm inside the modulator ruptures, the engine will suck ATF into the intake causing white smoke. It could be just a pinhole in the diaphragm at this point You may find trans fluid in the line or dripping from the modulator once the line is inspected. Replacing the modulator is easy and it is usually preset from the manufacturer. A small set screw inside the unit, accessible from the vacuum port, is a fine adjustment to shift points. Hope this helps.
Macho007 is correct about the smoke color. ATF has a tendency to appear white. If the issue is only at start up it is likely not the modulator valve. One diagnostic tip: If it is the modulator, during deceleration (as in coasting down a long hill or from a freeway off ramp) added vacuum will pull fluid to the intake which will be visible upon acceleration.
Watch your mirror for telltale vapors or have someone follow you to verify what is taking place.
The smell of the emissions will also be a tip to the origin. We all know the smell of oil, coolant and fuel. Pure water or condensation will smell slightly musty or damp. There may not be enough to have any odor at all.
Assuming there is no oil/water cross contamination there could be a small intake gasket leak but usually the white smoke would be constant not just at start up. It could be a small enough leak where coolant/water accumulates when the vehicle sits over night or for days.
|UPDATED|10/19/2017 9:08:35 AM (AZT)|/UPDATED|