I have a 2002 f150 4.6 and sometimes it smokes when i turn it on

 

Drain all the oil out and crank it and see if it still smokes.😂
Dont do it. What color is the smoke?

 

Its grey but it dosent so it all the time

 

How many miles on it.
Does it only do it if it has been sitting for a while?

Check you oil and coolant levels.

 

How this is the smoke? Can you still see through it, is there 0 visibility?

Just on a wild guess, it might be your head gasket, my dads old truck did the same thing when his head gasket went, but in fairness, I don't think there was a working part on that thing lol everything was either broken, or about to be broken.

 

Wouldn't head gaskets be blue smoke?

 

Head gasket is blue, that's what happened when my grandpas 87 Nissan sentra blew it's head gasket a few years ago. That was a good running reliable car too. Had 200k something miles on it and never had any major problems.

It could also just be moisture that's collected in your exhaust.