Back in the day when friends of mine used to enjoy the bitch's company, I remember hearing a couple of odd rumours about her. One friend was told to exhale a hit very quickly after getting a lung full to avoid having the smoke recrystallize on the inside of one's lungs. My friend always thought this was kind of silly, it seemed like having the smoke in one's lungs was the whole point of the exercise, and any goodies left behind would just absorb into one's bloodstream. Another friend was told to carefully heat a fresh pipe until smoke blows out of the top, because the first bit of smoke can have potentially harmful impurities in it. However, this friend found through personal experience, that first hit from a fresh pipe tends to be one of the best, and that sometimes the last couple of hits seem to vapourize at a higher temperature, and have much less, if any effect. The same friend also heard a little tidbit from someone at a party, about not inhaling the very last bit of smoke in the pipe if it has been allowed to cool for a period of time. This person figured that the smoke was cool enough that it could recrystallize on it's way through your mouth or throat, and cause extra irritation. My friend experimented with this and thought that there seemed to be some truth to it, but who knows. I've always wondered how true any of it was, and was hoping someone could shed some light on it.