I've been popping my neck and finger bones since I was a child. Can anything bad happen from my habit?
No not very. Likely.
Not necesssarily. Popping finger joints occur due to sublimation o fthe fluid in the joint into the gaseous phase with negative pressure brought on my manipulating the fingers and hence the "pop". You may also be hypermobilie with more flexibility. The important message is cracking your knuckles may not be a problems but you need a protective exercise program especially if your are hypermobile.