☞ TL;DR below ☜
__________________
So-called "addictiveness" can't be quantified. There is no logical way to score, rate or rank drugs according to addictiveness, and if there were, it would be different for each person.
If you start a habit young enough and your brain develops around that habit, it's often difficult to quit that habit later in life, much more so than if you pick up a habit when you're older.
"Addiction" means "spoken for" as a word, and it shares roots with words like "diction", "dictionary", "dictation", "indictment", "interdiction", etc. It's a lame metaphor, but the word stuck after the World Health Organization introduced it in 1958. Almost all drugs cause tolerance, requiring more and more in repeated sessions to achieve the same results. Some drugs cause tolerance to build much more rapidly than others. Also, some drugs can cause physical dependency when used repeatedly and frequently. Tolerance and physical dependency typically grow together. Avoid one to avoid the other.
Also, some people are genetically more predisposed to compulsive behavioral habits. This can manifest as various OCDs but also take the form of other ailments such as Drug Misuse Disorder, alcoholism, problematic gambling, sex addiction, etc. History shows it's best to deal with these disorders as they happen on a case-to-case basis, not blanket ban things. It's why we reversed alcohol prohibition, legalized porn for adults, and legalized gambling. One bonus to this is that it allows us to have safety regulations. I'm not concerned when I buy liquor that it might be poisoned or cut with something… that's thanks to regulation.
Despite alcohol's dangers, the public doesn't view alcohol with the same fear and ignorance that they do most illegal drugs. And it's kept that way by persistent cultural myths, no matter how made up or obviously full of shit they are. Don't fall for this, please.
I'm calling bullshit. First of all, "but it was supposedly on XTC" tells me a lot. It says you heard about this bullshit second- or third-hand, meaning it amounts to hearsay, nothing credible at all.
And if you know this person, why can't you clarify if it was while they were on "XTC", and I assume you mean ecstasy, aka: MDMA? And how did we cross over from talking about supposed LSD window-jumpers who get dosed without their knowledge and leap to their death under questionable government-spun circumstances, to now all of a sudden people getting paralyzed because now I guess you're claiming MDMA causes you to think you can fly and jump out of windows?
You either made that up or you're repeating someone else's made-up story. Stop doing this, please. Some of us want the Drug War to end, and this kinda bullshit works against that effort.
Ruh roh! I guess no one should ever be allowed to take drugs then!
Yes, I know. Drunk people do that kinda shit sometimes. I'm not a fan of that drug, and I've seen it lead to some horrible decision-making, criminal shit, physical violence, alcoholism, destruction of property, ruining of grades and/or careers, cirrhosis, incarceration, automobile accidents and early death, etc. AFAIK, none of the drunks who fall out of windows did so thinking they could actually fly though. It's accidental and probably not the results of delusional thinking brought about by the drug (alcohol).
I'm sorry for calling this out bc it feels shitty, I don't like doing this, but this is a harm reduction forum, and it's important that we spread the actual truth, dispel myths, rumors, and folklore horseshit, and build a better future for ourselves and future generations. Drug prohibition is the actual scourge, not the drugs themselves. Those are immutable… they don't go away and neither does the demand for them. Criminalizing drugs years ago was a major tactical mistake, as we can clearly see now. And flipping the switch to legal isn't something that will work either. It will result in disaster unless it's done cautiously and correctly while cooler heads prevail.
Regardless, LSD doesn't make people jump from windows thinking they can fly. If it's ever even happened, it's exceedingly rare to the point of not being worthy of consideration.
__________________
TL;DR ☞ It's quite ironic that you and several others in this thread are the very reason these myths persist. Please stop spreading this bullshit, bad info. Thanks