Please be more specific. What colour is the smoke, and how/when does it do it?
Black smoke - Too much fuel or too little air. Worn injector nozzles, blocked air intake or exhaust, stuck open EGR valve.
Blue smoke - Burning oil. Worn valve guides or valve stem seals, worn cylinder bores or piston rings, worn turbo.
White/grey smoke - Unburned fuel. Loss of compression.
White vapour - Coolant in engine cylinder. Faulty cylinder head gasket or cracked head or block.
This list is not exhaustive, but hopefully might give you a few things to look out for.
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