Personally, I wouldn't run it. Back when I didn't know any better, I ran a can of it through my truck on my mechanic's advice. The motor has 140k on it, and still runs strong, but the Restore didn't do anything for me but give me a slowly developing rod knock. k20 was telling me about the time he poured a can of it out, that it changed colors as different layers of metallic particles came out.
Right now, I run Lucas Oil Stabilizer. Some will tell you that it's bad, not needed, etc, but in my experience, it quieted the motor and it seems to run smoother at all temperatures and rpms, so it's gotta be worth something.
Anyway, about that smoke, what color is it?