I don't know if I use smoking as an alternative - but I do smoke and SI.
I'm a very on-off smoker. I quit in september last year, and didn't start again until december, and since then, I haven't been a proper smoker, as such.
However, I have noticed that when I'm smoking more, I'm SIing less, and if I'm smoking less, I'm SIing more. I don't know if that's because I'm damaging myself in another way, or if I'm calming myself down with cigarettes...
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