White smoke is caused by a few things, its cold, had water in the pipe, the head gasket is blown/leaking or the head, cylinder or block has a crack and is leaking. If it keeps pouring out white smoke constantly its the head gasket/head/cylinder or block most likely. If its just for the first 2 minutes or so its normal. It SHOULDNT be the head gasket or anything as its very rare but u never no with these clones. Sometimes theres a little bit of white smoke that comes out constantly but it shouldnt be very noticeable. If its enough to make u not able to breath thats a bad sign haha. Check over the engine, check to see if the spark plugs in tight, no cracks around spark plug hole, head is fine ect.
Hope that helps,
From Brendon.v