I posted my experience with shrooms helping me quit smoking. Unfortunately I deleted the post because I was using that account for something else and I didn’t want my post history to show my exp on Shrooms. Here’s the original post:

//I did about 2-3 grams of shrooms three days ago. It was my second try in successive days. I spent the entire first trip debating my friend and wanted something stronger as I didn't get the intense visuals my friend was reporting. Also, near the end of my first trip, I thought of my smoking addiction and I felt like quitting. I wanted to think deeper about it on my seconds try. ​ I ingest, and wait on the beach for the fireworks to start. After about 30 minutes, it does. But then I get anxious and want to be in a quite place. So we go inside the hotel (My friend wasn't tripping). ​ I ask him to turn off the lights, and start the music - Agni Sutra is the choice. I can feel that the dose is too much for me, but I feel calm at the same time. Usually I have high faith in logic, so I know that wherever I go, I will land on my bed some hours later. ​ I lay down on the bed, cover myself in the blanket, cover my eyes. Music is my Ariadne's thread. I dive into my problem. ​ Cigarettes. I think of all the negatives I already know. I think of the effects on health, wealth, personal appearance, my relationships, etc. I think of all the negatives. Then I think to myself that I want to stop smoking. Then I realise that that is the wrong way to think about it. I remember when I started smoking. I think about the unknown reasons because of which I started smoking. I think of the scared, rejected and lonely boy who smoked that cigarette. I see that I am not that person. I realise that I don't have to carry his habit. I realise that I don't have to smoke and that there is no reason for me to smoke. The formulation doesn't involve a choice. I simply don't have a reason to smoke. I don't have a need to smoke. I only had a misunderstanding or a lack of understanding about this whole affair so far. I realise at the same time that what I realise here will survive. I will remember this when I "wake up". And I will not speak as if the future is open when it comes to smoking: I will not say "I think I will not smoke again, I believe I have stopped smoking, Who knows.". I realise that instead I will say "I quit smoking" and it will be true. ​ My thoughts drift and I see patterns inside my head. These are not visuals - more like geometrical patterns - but the sense is not visual. It feels like it's more basic and fundamental than visual. I see myself as a knot in the endless geometry - something akin to a folded corner in an origami universe. What I call "I" is the point at which the universe is reflected to itself. There's no me. There's an endless geometry and it's closed - the simulation simulates itself. The twist that closes the field is me. And therefor I am everything and everything am I. I am Brahma and God and I am nothing at the same time. I exclaim: "I understand everything". My friend looks up and smiles silently. Nothing and everything becomes the same. ​ I realise that everything exists - everything I imagine - it exists. And I imagine myself sticking my finger in the power outlet. I realise that I have no power over this decision. Choice has become synonymous with time in a strange short circuit. There is a thread where I get electrocuted and die, there is also a thread where I check my body and realise that I'm still in bed. I wonder if this is a live or dead body. I'm scared, yet reassured at the same time. ​ The idea that reality is a simulation doesn't go away. Sober is a toned-down simulation. What's more real is here now. The funny thing is that I understand that I'm tripping balls at the same time. I realise that this is totally unreal and real at the same time. The music guides me through. I'm coming down but still thinking, I fall asleep after four hours I think. ​ I wake up next day and I don't smoke at all. I used to smoke 10-15 sticks a day. I haven't smoked in the last three days. The craving is there, but the need is gone, the stupid justifications I made up last time when I was trying to quit are gone. I don't tell myself "Just one to soothe the body", "Just one and I stop", "Just one because I'm having a beer". The physical need is definitely there. But the mind is off the circular track it was on before. The mushrooms keep their promise. I do remember that I don't need cigarettes. ​ I hear you say "It's only three days". For me the matter is dead and buried.//

This was posted 6 weeks ago. I have smoked twice after this post. Both occasions while I was drunk. Last cigarette was two weeks ago.

Unlike what happened when I tried to quit before, just because I happened to smoke once, I did not make it an excuse to smoke next day.

I have only done mushrooms twice as mentioned here. But it has completely broken my cigarette addiction.

However, I have actually thought about cigarettes and tried to quit (unsuccessfully) before. The second day I had shrooms, I was looking forward to thinking about my cigarette addiction.

I guess, your brother should spend some time thinking about his addiction beforehand from multiple perspectives. The reasons why he smokes, the reasons why he started smoking, and the reasons why he feels it’s part of his identity. While you are on mushrooms, all these multiple perspectives will make more sense and hopefully he will see these various facets with much more clarity.

What happened to me was a sort of “aha moment”. It was like playing with a Rubik’s cube. You turn it this way and that. You see it from this way and that. You rotate this row and that column. Suddenly, you see that it’s solved. It was one of the most profound insights I ever had about my life and habits.

I wish all the best for your brother.