I'm curious as to what people think about chokes, strangles and their safety. I think I read somewhere that in some Judo and Jujutsu classes people actually practice these on one another until they lose consciousness, which doesn't seem very safe to me as the brain can be damaged very quickly if deprived of oxygen. How long does it generally take to make someone pass out with a choke or a strangle hold? Is it easy to go too far and actually damage someone with this? How long does it take to regain consciousness typically? Is there any indication of lasting damage that anyone has ever heard of? For context, I'm asking because I've been taught some choke and strangle holds but not in any great detail, not because I want to do this to anyone. I like to understand the potential consequences of techniques that I am taught, and while this is quite simple with something like a wrist lock or throws, depriving the brain of oxygen seems like something of an unknown which worries me a bit. I'm really looking for people's personal experience of using them, perhaps in systems like Judo that use them a bit more, rather than any more technical information on oxygen deprivation. I will of course ask my instructor as well, I just wanted a wider information base. My only real experience is using them until someone taps and a couple of times being unable to escape them myself, starting to feel light headed and then tapping. Some thoughts, experiences and knowledge would be appreciated!