I just washed the engine bay. I notice the headers are smoking. It probably smoked a little before, but now i see it coming out with the hood shut and my lights shining on the smoke. The smoke is probably burnt oil, I had to put about 1/2 quart for 1000k. Is it ok if I didn't fix it?

 

just let it all burn off... it should be fine.

 

Header, singular. You have one header. Unless you have a V6 Accord, Legend, etc.

Is the valve cover gasket leaking all over the header? If it is, replace it and wash off the spilled oil. After it burns off, it won't smoke until that gasket goes bad again (about 10 years later)