Firstly, do not panic. Syphon or drain the diesel out as much as you can. Put in some petrol.Yes you've probably fouled the plugs. They're only $5.50 each. Change them. Some of the smoke will be from diesel which is coating the ports, and exhaust etc. See if you can get the engine to operating temp, that will help. Leave the toluol in the can. Get it warm and go for a ride at night. This is not a rocket specific problem, I did it to my car when I was about 20. We've all made errors. Good luck.