How do you fix white smoke coming from exhaust?

White smoke from the exhaust means your vehicle is burning oil. You engine needs to be rebuilt. There is no cheap fix.

no, if white smoke is blowing from your exhaust, it does not mean your car is burning oil, it could just be condensation forming in the exhaust. If it does this just on start up condensation is likely the course, if it's a grey/blue colour, it means your engine is burning oil but does not mean the engine needs to be rebuilt. Keep an eye on oil level, check how many miles/kilometers you travel before you have to top it up and how much you have to top it up. Type of car and how many miles/kilometers it has gone would also be handy. It might just be valve stem seals; try thicker HM oil, there's also a few oil additives you can add to help for that problem. It's definitely worth a try. It could just be a piston sticking a bit, some engine cleaner oil additive normally works wonders for this. Be sure, though, if you take it to a mechanic shop, they are going to say that the engine needs a rebuild so that they can make more money. It happens all the time, 70% of the time this is not the case.