I know this halon is very toxic but in a few years of flying nor I or my colleagues ever used it. We know we have it there and that its very effective. Id rather be intoxicated with halon and treat my lungs than hving a fire out of control in the cabin cos we all know its over if that happens.
If they give me something else which is less harmig for the enviroment and does the same work Im happy. If not they 'd better think twice.
Someone said here to double the number of fire extinguishers (if they are changed with something less effective). You can put 100 of them but if the first one is not effective and you are wasting time using another two than you 're probably gone.