Just today, my '95 S-10 Blazer started smoking. It lets out a big puff of blue smoke upon aceleration once warmed up. It has 127k miles and runs great otherwise. I'm doing an oil/filter change now, any other ideas?

How cold was it that morning you started it up? Mine billows LOADS of blue/white "smoke" on cold mornings. It has only recently started doing it when outside temps are hovering a degree or three North of freezing. Condensate/water is *normal* to see in blue-white clouds on cool mornings.

Possible worn out valve guides and seals, Did the truck have regular oil changes in it's lifetime? How long have you owned it?