Sensitive topic but I was having a casual discussion today when couple of my friends said they've already informed their families to rather let them die than to put them on machines like ventilator if the time comes. I've seen ventilators myself and I know it is an agonizing life support system with a lot of after-effects as well if the patient survives. But why not if it it is the only option that may help you live longer? Even from an Islamic perspective, isn't it a conscious attempt to die or commit suicide in other words which is sinful? Posters having a medical background may provide a different picture here but I'm just trying to understand the common thought process of people about going through the pain of life and death here.