Exactly.

When I was in intensive care because of my last attempt to commit suicide, my wife told me later that, at one point, I regained a feeble state of consciousness when she and a doctor just happened to be there. The doctor told me that I was "lucky to be alive" and that she tearfully asked me "Why did you do it?" and that I muttered "I don't want to die.... I just don't want to live".

What made me say that, I don't know. I don't remember much from back then. People smarter than me could probably explain why. But since that time (a year and a half ago), I have come to realize that, for me, it is a true statement. I have even discussed this with my therapist.

I also agree that passive suicide is letting whatever may be causing you to die, not of your own doing, take its natural course. But I'm sure someone can philosophically argue that the action of letting yourself die is, in and of itself, being active in your own death. Action by non-action.