Yea- Cummins uses an intake heater, which works pretty good. Simple and failsafe.The B series Cummins were direct injected and did not rely on glow plugs for cold starts.. They will still start a little hard and blow the white smoke tho. There a FAR better engine.
White smoke on a cold startup does usually indicate it's a really cold start, but can be an engine in need of a valve adjustment.. common mod is a momentary switch for the glow plugs
It isn't uncommon for a diesel to be hard to start in cold weather- what are you calling "hard"? You may have a problem, but it would help to know how hard of a time you are having, and what is routine hard starting for a 6.5? You may just be getting used to a diesel, and not really have a problem.