Most common cause is hoses and next is water pump.
If you're running low on anti freeze, and the car is smoking, AND if it's running a bit rough, you may have blown a head gasket which would allow for coolant to pass into the cylinder(s) and both cause the coolant level to drop and the car to smoke (steam).
If the smoke is white then you have a blown head gasket and the leak is coming from the head gasket if the smoke is blue or black it is not related to the leak. They may be two seperate issues, leaking antifreeze could be the waterpump, a hose connection, leaking radiator, cap, or gasket for the thermostat.
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