I don't know. I have no certainty and the only thing I can do is to wait and see how it might go for those close to me who decided to take it. I am not responsible for their decision and if one will die after one year or two years or more, I still won't be able to know what exactly caused their death. For me, it's unknowable. For others, it's not, they make experiences of a very different nature. I don't deny their experiences and conclusions.
I think when we start arguing about deciding a question for someone else that is in principle undecidable, we end up fighting. I accept when a relative or friend decides to decide this undecidable question for themselves. I would then have to learn to deal with his or her possible death when and if the time comes. I will not find someone to blame for this, because if I did, I would deny the decision this person has made and pretend that he or she never made it.
You can know the cause of death. Don't act stupid. It is easy to know. Step into my office I can walk you through the steps.
As long has you haven't found a way, in which your mind can sneak into mine, where it sets itself and lets me think things and move my arms and legs through your commands, you cannot say that I know things. The only thing you can do, is to say that YOU know them. So you did. I am fine with what you think you know.
I was just looking at the study Israel did.