Correct me if I'm wrong, but doesn't Houston now have the title of "Worst smog in the US"?

The smog pump itself wouldn't make nearly that much of a difference in your emmissions. Even a car with no cat has lower CO than that. You're dumping WAY too much gas into the engine. Get a new O2 sensor, and your plugs are almost surely fouled black by now - new plugs wouldn't hurt either. Check your injectors for dripping or uneven spray. Check the cap and rotor as well. Lastly, run a large bottle of injector cleaner in half a tank of gas and "Drive it like you stole it" on the highway for a good 10-15 minutes to clean out all the carbon deposits you almost certianly have on your valves and piston faces.