So, I'm constantly hearing about not getting my pipe too hot, and it seems that this is everyone's number one priority ans concern. What is considered too hot? I understand that if the pipe goes out more than normal, it has probably to do that it isn't packed 100% correctly. But, what is too hot? I noticed when I smoke, it tends to go out quite often, but in terms of temperature, it goes only quite warm. I've never let it go unbearably hot. Is there something like a rule of thumb to look out for?