I am writing a book in which there is a homicide. After countless hours
on the net, researching among such groups as the Hemlock Society and their
progeny, I have decided that cyanide was the method of choice. I have a
question, however, concerning its chemical breakdown. If my protagonist
were to put a cyanide tablet or a small amount of cyanide in liquid form
into a cup of soup (hot) would the fumes from the interaction overcome him
before he is able to murder his victim? I appreciate any insights you
might offer.