to me it m,akes sense that the cannabis could have been the problem. Coz he too it to relax yeah? if the medicine had a reaction with the cannabis then its mroe than plausable. The only thing know would be to test cannabis against teh medacine. But then there is the problem that most people are able to take the reaction, yet Bruce may have been illergic to it...

i have seen so many theories before. there are lots of sites that tell this is the reason. and alot leave out detials. but i still dont think this is the full reason. i also think theres alot supernatural stuff involved. from things like his family curse, too the master with the secret technique, that supposedly started bruce lees headaches.

i dont think anyone will know the other side to bruces death. theres also the things about the demons and evil spirits. i think bruce lee died protecting the right to teach anyone secret moves and techniques.

Bruce Lee's death was officially attributed to Cerebral Edema.

On July 20, 1973, Lee was in Hong Kong, due to have dinner with former James Bond star George Lazenby, with whom he intended to make a film. According to Lee's wife Linda, Bruce met producer Raymond Chow at 2 P.M. at home to discuss the making of the movie Game of Death. They worked until 4 P.M. and then drove together to the home of Betty Ting Pei, a Taiwanese actress (claimed by some to be Lee's mistress) who was to have a leading role in the film. The three went over the script at her home, and then Chow left to attend a dinner meeting.

A short time later, Lee complained of a headache, and Ting Pei gave him a prescription analgesic known as Equagesic. At around 7:30 P.M., he lay down for a nap. After Lee didn't turn up for the dinner, Chow came to the apartment but could not wake Lee up. A doctor was summoned, who spent ten minutes attempting to revive him before sending him by ambulance to Queen Elizabeth Hospital. However, Lee was dead by the time he reached the hospital. There was no visible external injury; however, his brain had swollen considerably, from 1,400 to 1,575 grams (13%). Lee was thirty-two years old. The medical staff examining him concluded that the immediate cause of death was Cerebral Edema. Dr. R. R. Lycette of Queen Elizabeth Hospital determined that the swelling in the brain, and Lee's untimely death, was the result of an adverse reaction to one of the compounds in the prescription Equagesic tablet. The autopsy also revealed traces of cannabis in his body although doctors were certain it did not contribute to his death. On October 15, 2005, Chow stated in an interview that Lee was allergic to Equagesic. When the physicians announced Bruce Lee's death officially, it was pronounced Death by Misadventure.

However, the exact details of Lee's death were controversial from the moment it was announced. Bruce Lee's iconic status and unusual death at a young age led to several conspiracy theories about Lee's death, such as a murder involving Triads seeking protection money, vengeful rival martial artists, or other enemies like Chinese and American directors and producers — but none of these are supported by any evidence. His sudden death has since passed into the realm of legend, with one legend claiming that Lee faked his death, and will return when he has perfected his martial arts.

en.wikipedia.org