1998 Toyota Camry gray smoke from exhaust while driving

I had just put a bottle of Lucas injector cleaner into my tank. When I got on the highway, a whole lot of grayish whiteish smoke started coming out of my exhaust. I didn't lose power and I pulled over just in case. The smoke stopped and I went to the next exit to check the oil and water. I was a little low on oil so I put some in. The coolant was fine. There was no smoke again until I got on the highway ramp and it started pouring out of the exhaust. Again no loss of power. Is it an oil gasket, oil pump or could it be the lucas treatment? Help!