It depends what you mean by 'snuffles' because my understanding is that's a respiratory tract infection, but upper or lower? Also, caused by what? But equally, are you talking about any respiratory disorder, of which there are many, that can present by laboured breathing, coughing/sneezing, etc.
I always understood respiratory tract infections (such as pastuerella, bordatella, etc) were present in all bunnies but stayed dormant unless the bunny got run down and then the bacteria raised it head and multiplied and caused the infection. So one also needs to question what happened just before the diagnosis of 'snuffles'.
I had one who had a respiratory tract infection and that arose after he was found, half dead, at three weeks old, in a box. A URTI was a small price to pay for all he'd been through (and all he would have to go through in the future). I've had other respiratory disorders, such as allergies, pallat issues, genetic malformations, previously unidentified cancers. I also had acute pneumonia develop in a bunny who was seriously ill with no hope of recovery- that was when we called it a day.