Well, it depends on the reasons one wants to ctb. In my case and due to the disabling tinnitus I have since 8 months, 5 months in I started thinking what is the point of all of this, why should I stay and suffer like that when I can end it all? and since then, although I am a tiny bit better at dealing with it, I still want to ctb even more, my brain does not seem to get conviced of accepting to live like that. I need to mention that I had other health issues that I have been dealing with for more than 9 years, but I have never thought of ctb until I got the tinnitus.
So the tinnitus although by itself an enough cause for me to ctb, it made me question my life in a way in which I never did, so indeed it seems that a door has been opened and it might be very difficult to close again. It made me question the structure of society and how it's built, and realize how illusary everything around us is.
Next month I will go to my home country for some time and try to find meaning in life again, if I fail to do so, I will be booking a ticket to go back to my "real home", the universe, the void.