If the smoke is coming from under the hood and not the exhaust, then at least you shouldn't have to worry about it leaking into the combustion chamber. To give yourself better piece of mind, check all coolant lines very carefully. You should never have to overtighten the bolts on our engines, because it's aluminum, and very easy to strip the threads or crack something. Then, it'll be easy to get a leak.

Just get a nice, bright flashlight and give the engine a good inspection. Don't forget that there are a couple coolant lines that run beside and behind the intake manifold. Also, park your car somewhere on a clean surface after driving and leave it there overnight. The next day, go out and peer under the car to see if there are any new puddles of coolant. That's a good way to pinpoint an engine leak.