Cams, once they show wear, usually have a short life after that and they can wear in a hurry.
800's have been know to drop valves, and that is something you do not want to happen!
Sooo, if your engine is blowing smoke, valvetrain is showing its age, it might be time for a teardown. Continuing to ride might not be a good idea.
SFair's right and this is good advice Rick. The 800 doesn't need to have the entire engine torn down to change camshafts but if you are up against that much mileage then a complete teardown cleaning/inspection/rebuild is a good idea to replace anything that has reached or passed its service limits if you haven't already done that. I only say this because it seems you like your bike and intend on keeping it. I once read on here about a member's bike suddenly dropping a valve one morning when he started his bike. He had someone use an internal engine camera to diagnose the problem but all he had to do was take the heads off to see that. Anyway, I assume this is what you meant when you said you would work on it during the winter.
Because you will be hard down without riding and if this is your only bike it's a major drag for serious riders like yourself to spend all this time unable to ride and having to check valve seat angles/diameters, valves, camshaft runout and height, camshaft/cap clearances, camshaft journal diameters, camshaft chains, camshaft tensioners, camshaft sprockets, rocker shafts/rocker arms, cylinder walls, piston rings, pistons, crankshafts, trans etc. etc. etc. and so basically you can classify this as a rebuild but it's all worth it in the end.
You are up to the task though and you should come out just fine. The only thing I wanted to emphasize is that the camshaft cap is machined/mated for the head it comes with and if the cap is beyond service limits I would buy a new head and trade in the old one for a core if the old head is beyond service limits or get the new camshaft cap machined/mated for the old head if it is still within service limits. I've heard about people replacing camshaft caps and installing them on the old heads without having them machined/mated and having some serious problems after that. Keep us updated and hope you had a good Christmas Dinner.