help smoke from tail pipe?????

I was just wondering about my 2000 toyota solara every time I start my car a cloud of smoke comes from the tail pipe. It dosen't keep smoking only when I turn it on. I just would like to know what it could be????

The valve stem seals are worn out allowing oil to leak down into the cylinder after sitting for a period of time which inreturn burns when starting the vehicle and produces a smoke cloud. This is more common with the 5sfe motor then the 1mz motor. Hope this helps.