Neck cracking is risky. I'm not sure any other normal type of cracking is risky for a healthy person.

I'm pretty sure my joints crack more when I haven't been active for a while. However, the toes are an exception.

I wouldn't be surprised if the theory has a basis in fact. I do walk on my toes a lot, because of mid-foot problems. By paying attention, maybe I'll notice if my toes need to be cracked more on days when I'm on my feet much.

Have you ever had an x-ray?

I crack them all and usually do it by pushing down. At times, the toes (maybe not the middle ones) can be popped by pushing them against the ground. If I'm lazy, I might pop the toes with the help of the other foot instead of my fingers. The little toes sometimes I pull on to pop.

I've never discussed it with anyone at length. The only brief comments I've made have been in response to others' observations. With a childish exception that I shall withhold here

8O No, I haven't experienced it, and I don't want to.

I'm not sure exactly what you mean, but there are implants. Artificial discs, which are new and for replacing discs that are worn out like mine. Not worn out from cracking, probably.

I twist. I don't want new methods for cracking my joints; they sound disgusting to me the hypocrite.

I crack everything soon after I wake up, because stiffness is bad then.