1992 Honda Accord engine smoke

The mileage is up there and it is probably time that you experience some problems. I suspect that you use some oil and/or coolant. I would suspect that when setting, oil leaks past the seals on the valves and drips in to the cylinder. It contines when running but it doesn't get a chance to accumulate like when the vehicle sits. What can you do? Acknowledge that the engine is in going down hill and you need to make a decision to live with the smoking until it gets worse, it will but it may take some time or have the vehicle overhauled or replaced. You could pull off the head, have it checked for warping, seals replaced and a new head gasket put on. The decisions are yours to make. Been a pretty good car and may carry you a lot further.