White smoke from my mazda diesel, any info?

when I start my car there's a cloud of white smoke from the exhaust but it goes away after some minuetes any idaes what it may be

that's water on your fuel system, get a fuel filter separator like racor brand or get some diesel water separator merchandise who will descompose the water taking the oxygen out from the water and let the hydrogen who is unstable and will give a more power to your diesel