Like @SassyRocks and @Alisa , Quitnet helped me forge my final (I am pretty sure by know) quit from smoking 10.5 years ago. It also was my introduction to online peer support so in that way it has been instrumental in helping me quit other substances too. Together with Allan Carr’s book which helped me change my mindset, the way I look to what smoking actually is (a stupid lying killing addiction).
I feel the actual quit wasn’t even that hard for me. I also feel that’s due to one of my personality traits, black and white thinking. Once I truly decided to quit, I just did. Cold Turkey. I took a holiday for a week or so if my memory serves me right. I hardly slept for a night or three, four. I felt like I had a pretty bad case of the flu for about a week. That was about it really. The weeks and months following that I spent loads of time on Quitnet, reading, talking, distracting, learning. Peer support made it stick.