Well, if engine is weak, and / or rings / pistons are deteriorated, then the smoke colour from the exhaust is Bluish (due to engine oil getting burned in the combustion chamber) and is constant.
White continuous smoke means leakages, and coolant getting burned in the combustion chamber, however, if there is water instead of coolant, then I am not sure that whether colour if smoke is still white, or any other.
@khizar_abbaspaki
If smoke is only in the morning, and then goes away, when temp is high, i.e. at noon, or when engine has attained sufficient temperature, then most probably, its due to condensation.