If that person doesn't reply this -LINK- should take you to a reply someone gave me about their experience taking 0.6 grams of SN. I'm interested in this persons experience as well though. I was considering taking half a gram or so myself. I've only ever licked a little off my finger and I don't think it really did anything.
Half and a month ago, I took somewhere between 0,4 and 0,6 g (lack of proper measurement tools). Mixed with 53ml of pre-boiled lukewarm water, took in the morning, on an empty stomach (haven't ate or drank anything else yet). I weigh about 80kg. I was writing down my experience:
3m to 7m after ingestion (minutes): minor difficulties breathing (difficulty increased over that time)
7m: clicking in my neck, I'm guessing my arteries in the neck area were pounding so hard I could both feel and hear the clicking (in the rhythm with heartbeat)
7 1/2m to 9m : "head went round, vision blurs, fainting, trouble concentrating", trouble writing my own experience, trouble finding words, I felt the need to bring the bucket next to my computer desk, in case I will vomit (I didn't)
11m: the fainting and nausea slowly go away; 13m: most symptoms went away; 15m: feeling good and normal
17m: "when I'm holding down my breath on after inhaling, I can feel the arteries in the neck area pounding so hard it feels like they hit something inside and it's not exactly pleasant"
37m: felt minor disturbances in breathing when walking around the apartment
That's pretty much it. I don't think I would dare to ever take more unless I'm going all-in. I'm assuming that time will feel like lasting forever. I've experienced this before and I really didn't like it. That's why I would probably try to masturbate in the process between ingesting and losing consciousness. Turn the everlasting anxiety into pleasurable experience while SN does its job. Quite ironic, really. Using against my survival side the same manipulation tool that is used in urging me to fuck and procreate.