T-boss 410 is correct, and a bad head gasket is probably the cause. White smoke is definitely coolant.
I'd try to verify, by using a leak down test first. It's a common, yet simple test. If you're unfamiliar, Tube can explain it.
The tool should be available from o'Reilly auto parts, loan a tool program, but call to verify availability. You buy the tool for extremely cheap, then return it when you're done, for a full refund.
The test is cheap, and easy. Unfortunately the fix is neither. But it's certainly a doable project.