It depends on where the oil is leaking from, and how much you are willing to invest.
A leaky valve-cover gasket is a common source of oil leaks, and is relatively inexpensive to fix.
Likewise, a leaky oil pan gasket or drain plug can be repaired for very little money.
Head gaskets can cause oil leaks - that is expensive to fix. A leaking oil pump can be replaced, but it will not be cheap. Leaking engine seals are also very pricey to replace.
The smog check there is one of 2 kinds. One they put the vehicle on a set of rollers and actually drive it with a sensor stuck in the exhaust. The sensor checks the emissions output and its either pass or fail. The other is just a visual check that all the factory emissions control parts are still on the vehicle and work correctly.
Shoot. I sold a 91 Toyota 4Runner for 1800 with all the interior ripped out leaving only seats and the engine was barely making it. Head gasket is an easy fix. I would sell it for 3000 if it was me.
If you took your vehiclke to a .ligitimate repair shop and they diagnosed it and quoted you a price to fix it. The shop is responsible. As an ex owner of a repair shop. That's my story and I'm sticking to it.
Since you said you keep blowing fuses, it's a very good chance there's a shorted wire or two bare wires touching each other somewhere. Good luck fixing it, I hate fixing electrical problems
Sounds like your head gasket is blown, the smoke will smell sweet like cotton candy when that happens.