I have a 2002 4.7 jeep grand cherokee limited. It has a miss. Smokes but no code. White smoke. Oil looks perfect on dipstick. No bubbles in coolant at radiator.

It misfires, that is clue one, and REAL.
the scan will tell you what cylinder misfires, , why wait.
why drag out knowing whats wrong, scan it, and stop wasting time.
and money, guessing will be expensive.
got tools>? or are you just asking for the blind folks to guess.
or worse like me quoting statistics.
first off that white smoke
you never once said where it shoot out of.
i can think of 3 places,
tail pipe end
engine bay,
or mid car.
where,
and more shocking is not say if the smoke is steam or oil burning.
steam will be AF coolant smell, sweet.
oil smells like burning oil and takes a long to time to go way,
if you have never smelled burning oil, drip some on a hot exh. manifold and learn now, and save guessing all day what white means.

no bubbles in rad neck. tells me (guessing) that its not dropping,
levels day by day. is it.
but is not proof, that. (if head gasket is bad it will progress worse)
best is lead down test.s
or doing an engine compression test. W.O.T.

lots and lots of signs there are.
engine overheating, funny sounds in the heater core, struggling.
spark plug tips turn green (or AF color)
steam out tail pipe end. hot and cold engine both.
steam pasting rad to side expansion tank.

why not scan it, first.
what if say P0306 is there.
so you do compression on cyl 6 and its 50psi.(dead fail)
all in 30min work. (i can do it in 15m flat, the scan in 1min.)
longer if COP COILS. (coils over plug)
why not? use a scan tool
you can not fix modern cars lacking said tool.
cant.\

Water in the gasoline, or a leaking head gasket. A leaking gasket may not show water foaming or discoloration in the oil, but level in the radiator will go down over time.