...the original cause of death was cannabis intoxication that resulted in a hypersensitivity..
Uh....hooey. If Bruce Lee died from cannabis he became the
first death from that in the entirety of recorded human history - that's about 11,000 years of human experience with cannabis without a single death now.
The active ingredients in cannabis are extremely similar in both form and function to a class of naturally occurring chemicals normally produced in the human body called "endocannabanoids". Anandamide is one such. If you were to be somehow allergic to or harmed by cannabis than you will be killed off by your own body's naturally occurring endocannabanoids long before you were old enough to consume cannabis. You would have been pretty miserable until you died that way too, as your body is peppered with CB 1 and CB 2 receptors that govern everything from pain perception and balance to sexual ability.
The claim that Mr Lee died from 'cannabis poisoning' is extraordinary and thus requires extraordinary proof. Unless and until you post up that proof, I am calling "bullshit". This calls the accuracy of the balance of your statements into question as well.
Secondly (and peripherally I might add) there is indeed such a thing as the Dim Mak "death touch", also referred to as the "poison hand" or the "poison touch". It is a knife hand strike to the front of the throat at the carotid artery on an adjacent nerve trunk nexus. The strike has the immediate effect of 'resetting' your blood pressure, which makes you pass out. It also often loosens or dislodges a small bit of arterial plaque if there is any at all present in said artery, sending that into the brain causing a stroke. It is said that this strike can kill within 24 hours.
The death touch is part of the arsenal repertoire of many accomplished martial artists, though I have never seen anyone actually use it as it is meant to kill, not just to win a fight.
Mr Lee's distillation of classic Shaolin Gung Fu and his constant expression of Wing Chung's Buddhist principles make him a very important personage in the history of the martial arts. His development of Jeet Kun Do along those principles was a major contribution as well. He expressed this philosophy very well in Enter the Dragon and in some of his other works as well.
The martial arts community has accepted that he died from cerebral edema, an allergic reaction to the pain med. Black Belt magazine has run countless articles on Mr Lee and his passing, check their archives if you need more. The rest is the kind of rumor that accompanies fame and the sudden death of a famous person.