To prevent this from happening, it is important to keep your vehicle's fuel tank full when it is not in use. This will help to displace the air inside the tank and prevent moisture from condensing. You can also add a fuel stabilizer to the tank, which will help to prevent the fuel from breaking down.
If you do notice excessive white smoke coming from your exhaust pipe, it is important to have your vehicle inspected by a qualified mechanic. They will be able to diagnose the problem and make the necessary repairs.