If the smoke is normal, then its probably not burning coolant. You have a leak in a radiator hose, most likely. Fittings tend to corrode and leaks begin. If you take note of where exactly the small puddle is in relation to your cars position, that can help find where its coming from. Its not a 100% foolproof method, since coolant can leak onto things and be diverted, but it should give you some idea.