White smoke coming from your tailpipe is not a good sign and is usually an indicator that your engine is burning coolant.
An engine burning engine coolant is usually caused by a damaged cylinder head, cracked engine block or even a bad head gasket.
If your engine block is cracked you'll need a new engine which is costly but if it's just a damaged cylinder head or bad head gasket then it's cheaper to fix.
If your vehicle has white smoke coming from the tailpipe it needs to be checked out soon because your engine could be completely damaged and you're gonna be stranded sooner rather than later.