Seconded. Jacob you are awesome. Such a guru!

Arielovett, you sound like an extremely bright and amazing person for 15 (or for any age.. you articulate wonderfully!) However Jacob has a pretty major point when he says that your 15 year old brain is not yet developed. As such, the components of your brain are not yet in their rightful places, not yet functioning in an adult, 'finished' state, not yet connected and wired up in the way they need to be to see you through life. The adult male brain is complete at age 25. Until then there are flaws in processes, such as calculating risk, cause and effect, etc. It's accepted that 21 is the minimum age the male brain can optimally function, it's why the legal drinking age is what it is. It's younger for sex, which doesn't have a direct physical effect on the health and makeup of the brain per se.. as do alcohol and drugs.
There's just so much we don't know about the brain, and are still learning. It's generally accepted that Fetal Alcohol Syndrome can result from maternal alcohol use, and nobody doubts children's brains can't cope with drugs and alcohol, yet many people still seem to think substances won't affect older children - simply because of size - many having reached adult height by early teens! But a teenagers brain is still in an active, crucial state of growth. Start messing with substances that affect the firing of neurons, the transmitting of hormones and chemicals between synapses, and you're playing with fire.
I would liken it to an analogy of my house - which has not been properly waterproofed and insulated during the building process. It looked fine when I bought it. But at some point in it's 'development' the protective layers of waterproofing were not properly laid, and while it looks fine from the exterior, every time it rains water seeps in further, so underneath the pretty surface are patches of mouldy damp areas, and patches of rot, weakening of the structures, etc. At 15 your brain is like a house without insulation, or waterproofing in place. Taking drugs is like exposing your 'uninsulated', unprotected brain to a environmental 'attacks', for which it's not prepared. The torrential rain is the substances you ingest. And it's anybody's guess what you'll be left with after the storm. Unfortunately your head is one place you can't 'move out' of. What you do to it now will depict what you are left with later on. And this goes for ALL mind altering substances, legal or illegal. And personally I believe marijuana is extremely powerful and dangerous to young minds, and not the harmless herb of enlightenment you might have come to believe. I'd be as worried about pot as about the LSD, even though you may never have given a moments thought to such a socially acceptable and widely used drug.
Blah blah blah! Shut up me! Sorry.. I can get a bit carried away, I don't mean to. It's just I have kids your age, and if I could hold their attention long enough to spout all of this, I would! ;-)
Anyways.. you're a smart lad and I'm sure you'll do fine (if you don't take drugs for another ten years ;-). Good luck!
Hi Arielovett,
Since on one has replied to your post I offer you my humble opinion on the matter.
I would say that 15 years old is too young to take LSD. Your brain is still developing and may not be ready to handle such an experience. Even strong marijuana can have adverse effects on a young mind. I talk from some experience as I did drugs from a similar age as you. You mentioned that you are doing guided Buddhist Meditation. This is under the guidance of a Buddhist monk? I would suggest that he/she would be the best person to talk about this matter.
Genuine spiritual development requires good health, and is also the cause and effect of this. Taking any kind of processed drug such as LSD will only damage your health and ultimately make spiritual development harder. I am not saying that you cannot have a spiritual experience by taking psychedelics, many people claim to and I am not going to dismiss their experiences.
If I could go back to when I was 15 I certainly wouldn't take the drugs that I did. Not because it was an inherently bad thing to do, but because it has just made things more difficult for me later on in life. I'm amazed by your writing that you are 15. I could never have written such a well thought out and mature post at that age. You seem to have a lot going for you. Whatever you decide I hope you are happy with your choice.
Jacob