I have a 91 Honda Accord that loses about a quart of oil every 300 miles. It smokes when i start it, after it has been setting for awhile, but then quits a few moments later. i haven't found any leaks that could cause that much oil loss. I park it on pavement and i've never seen any spots. Any Ideas?

The oil is burnt. It's leaking into the cylinder. You may have internal engine problem.

Might be valve stem seal replacement time. Is the exhaust pipe a bit oily?