I have a 1996 Camry and it seems to stall when there is a warmer day and the car has been sitting overnight. It does start after you rev the engine a little. Mechanic computer is not showing any problem. I have no problem starting it during the day after the morning stall.

 

If it smokes after the first start / stall, change your plugs, look for carbon build up, if the plugs have carbon build up then your valve seals are probably going bad. And the reason the car stalls / smokes is because of unused fuel / oil in the system. One thing you can do that might help the situation until you get the valve seals fixed is switch from 5W-30 to 10W-30, it's thicker and will not pass through the worn valve seals as easily.

If you don't fix it, the next thing that will likely happen is you will probably get an EGR Flow error code and your Engine Light will come on.

Your car will still run.. and except for stalling and smoking on the first start up of the day it will continue to show no other signs. BUT... if you love your camry... you'll get it fixed.

This was just a guess from the information in your question. With more information I or someone else may be able to diagnose it better.