Most likely the valve seals. They allow oil to seep into the cylinder(s) when idling. After you accelerate the oil is burned and the smoke stops being visible. Chrysler 3.0 engines are famous for this, watch some Chrysler mini-vans at the stoplights.
Could be a diesel? If not then replace your oxygen sensor on your exhaust. A bad oxygen sensor causes the exhaust smoke to be dark in color.
It could, if it's leaking.
Bad valve guides or seals
what is the worst for your health breathing in tobacco smoke or exhaust fumes
emissions and exhaust
It depends on how bad the smoke is. If the vehicle doesn't run, it could be a blown head gasket or a cracked head.
No, it will not cause smoke from the exhaust pipe. However the leaking oil can drip on the exhaust manifold where it will be burnt and smoke.
how can i get black exhaust smoke stuck on my dual exhaust
you could be leaking engine oil onto the exhaust or it could just be rusty water that is evaporating and causing the smoke.
If the smoke is black it could be caused by a faulty fuel pressure regulator which could be causing the engine to get too much fuel.
If the smoke is coming from the exhaust then it's coolant. If its not turning over then it could be hydrolocked from a coolant leak.
smoke poured out of the exhaust of the car.