This might be a multipart story (if people are interested) as it started a couple years ago and is still developing. I found this subreddit and I thought I would share the story even though it might not be a strictly "darkside" story. There will be a TL:DR at the end for those who don't want to read the whole thing.

I (at the time 18) met my girlfriend (at the time 19) through mutual friends in 2020 when we both started university. She seemed like a shy and quite girl but she loved drinking (you know how university accommodations are) and did not smoke (neither did I) to my knowledge. I haven't drank ever before, but one day we decided to drink and I let slip that I want to go outside and smoke and I love seeing smoking girls (this was like 1 or 2 months into dating) maybe it was the first time having alcohol but pretty forward right? She was slightly like huh. But I guess since it was my first time drinking she brushed it off.

Fast-forward to maybe a couple months of dating. We bought a sex game where each person would take a card and there would be some sort of dare. When it came to my turn, the card said something along the lines of "show your most favourite sexual/ porn/ category video" so I had her guess the through the pornhub categories and since "smoking" is pretty low in the list, it took her a while to find it but once she found it I revealed to her my smoking fetish. At the time, she told me that she would never be able to fulfil this fantasy that I had and that I was out of luck.

Fast forward to a few months later, we moved in together. We kind of had a discussion about the whole smoking thing and I told her that she shouldn't smoke and it's probably not a good idea because of all the health risk and so and we somewhat promised that she wouldn't smoke.

A few weeks later, I come home from work and find a packet of unopened Marlboro Reds. I went ape shit and she was really mad but she thought it was no big deal. For reference, I liked the idea of her smoking but I just didn't want her health to be jeopardised just because of some fetish or whatever. We had whole argument that night but I settled and decided that maybe a few smokes here and there won't hurt right? So I finally decided that I'm cool with her smoking every once in a while.

The next day she had work, I walked her to the bus station and she decided to take her pack with her. She lit it on the way to the bus station and I was instantly hooked by the idea of her smoking. It was just perfect, it was like a dream come true, despite me being against the whole idea at the start. She was smoking although not perfectly as she wasn't inhaling properly but I didn't point this out to her at the time. By the time we got to the bus station, the cigarette was almost finished and she gave me a smoky goodbye kiss. I've always hated the smell of cigarettes but this was just something else. She took the pack with her to work. I was hoping so much that she would smoke on her break but to my surprise she didn't smoke a single one. At this point, I was on the fence whether I did like her smoking or that the habit was a bad idea.

TL:DR : My non smoking GF found out about my smoking fetish and decided to buy a pack of cigarettes without my knowledge. I was mad because of the heath risks but decided that a few here and there wouldn't hurt. She smoked her first on the way to the bus station and I was instantly hooked but did not know if it was a good idea or not.