Can you determine if it's diarrhea or runny cecals? If it's pure liquid, best to get Smokey to a vet.
If it's runny cecals (smelly, clumpy), it's probably a diet issue. Mine get that when they overdose on carbs and sugars (among other things).
Either way, makesurehe's getting plenty of hay and water, and not much else(althougha small amount ofrolledoats might help). Definitely get him drinking(I've been spiking Pipp's water withapple orcarrot juice), and make sure you have some Pedialyte on hand. It its true diarrhea, dehydration is a serious consequence.
I'm sure the links M.E. sent will give you a better idea of what to look for.
Sending get well vibes Smokey's way.
sas