It is highly suggested that you get a new reg. Even though it may be working now, it will most likely fail in the near future or be more susceptible to voltage spikes, potentially frying your system. The very fact that you got smoke while fiddling with it tells me you were probably soldering to it with power on. NEVER NEVER NEVER do that. It is dangerous not only to your electronics, but to yourself. You could easily get a shock like that. Even though you're not working with very high voltages, the currents are high enough to do damage.