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Unfortunately, the Goran'Agar Rehabilitation Clinic actually has a very low success rate
(i.postimg.cc)
[Image transcription: A "Doctor's hate him" style meme titled "The Founders HATE Him" about Goran'Agar. The side text reads "He beat his ketracel-white addiction in less than 35 days using this simple trick. FIND OUT HOW"]
The fact that he didn't realize he's not addicted until stranded suggests that few Jem'hadar ever personally experience withdrawal. They receive regular doses and then die in combat, so it rarely comes up. Almost everything they know about the effect of white withdrawal is received knowledge.
If it weren't canon that they need white to survive, then my headcanon would be that that they could totally survive without it and they've just been lied to all along. Like that episode of TNG.
My interpretation was that ketracel-white was both chemically addictive AND needed for the specific amino acid (or whatever it was that their body could not produce).
This, to me, meant that any Jem'Hadar that wanted to drop ketracel-white would go through withdrawal and then die painfully. For most Jem'Hadar the two different aspects would be indistinguishable from each other and viewed as one effect.