I just bought a honda civic with 100,000 miles on it, I noticed yesterday the car gave me a white smoke just when I started it, I know that is not good sign, this morning when I started it no white smoke coming out but I takes me couple times usually to start the car
The fuel seem is not clean or something it doesn't start,
Could anyone please give me an advise

Likely a blown head gasket, where antifreeze is leaking into the cylinders and being burned. If an aluminum head engine is allowed to overheat, the head may warp and the gasket gets blown. You may be facing a $1,500+ bill to machine the head, repair any damaged valves, and install and new gasket.

I HAVE A 2.0 HONDA CIVIL AND LATELY DISCOVERED THAT THE ENGINE OIL LEVEL SOMEHOW WENT DOWN . JUST COUPLE OF WEEKS AFTER SERVICING.There are also small amount of white smoke from the exhaust every time I start my engine.
My friend has help me by stepping the acceralator and from back I did saw some amount if white smoke from the exhaust pipe.
Anyone can advise?:(

thomasng, white smoke is usually a sign that engine coolant is being burned. Frequently, it happens after an aluminum head engine overheats, where the head gasket blows and the coolant gets into the cylinders and is burned. It's also likely some oil is being burned.