Let me preface this by reminding you that everyone's brain chemistry is different, we all react differently to various substances and therefore you may disagree with me, but please understand these are my experiences - not yours - with said substances.
Dust. Will never do it again.
I'm glad PCP has a stigma, even though the stigma is innacurate, which is that it is portrayed as a drug that makes you go crazy and lose your mind with a bunch of dysphoria - this couldn't be further from the truth, you are drunk with power and therefore could be called crazy, but you do not lose your mind in any way, shape or form. It is unfathomably intense and easily THE harshest street drug out there, and nobody will understand remotely unless they try it (the closest you could get without touching it is a heavy DXM trip with some combos, but it still wouldn't be close). It is a dissociative but unlike K or DXM, it is also a stimulant, with psychedelic effects and effects of power. People often say it's like K but longer and more intense. It's not like K at all in my experience, it's closer to DXM than K. Imagine DXM, Speed, LSA, Soma without sedation and H combined, then multiply it by ten: you have PCP. It is "delusions of grandeur" the drug. The drug literally makes you feel like a god for 20-30 hours, like you can do anything, and you will do shit like lift things way beyond your muscles safe capacity and not even notice, or punch holes in the wall just for the fuck of it and not feel any pain. Let me make myself perfectly clear: there is NO pain. None whatsoever. It is a better painkiller than Heroin. You could have your arm cut off and you would not feel it, literally. I'm being dead serious, and on the comedown all it would feel like is a pinch. Your 'field of view', if you will, is expanded. Your world is like a video game and you are a protagonist capable of destroying it all. That's what Dust feels like to me, and I loved the feeling. I couldn't stop thinking about getting more for nearly two weeks, it was constantly on my mind. For me, this is frankly the most addicting substance on the planet earth. Opiates are nothing in terms of addiction potential to Dust. It is for this reason I know it's dangerous, as I've seen where those addicts end up. It consumes their life and mind, moreso than even meth, and because of this I will never, ever take it again. I had an amazing time, and I will cherish that time, but just like my one time using IV hydromorphone, it will not be repeated.
Other than that, Z-Drugs. My avatar is Zolpidem, which is my favorite drug of all time. If I could start again with no tolerance, I would take just 10mg of Zolpidem over any opiate. Most euphoric, calming and amazing thing I've ever felt. I have just recently successfully broke a nearly 2 year dependency with diazepam and lots of kratom, and I'm tapering off of those now. One day, when my tolerance has gone down, I'm sure I'll take some more again, but never consecutively or I'll end up in the same situation. It's funny, it's prescribed to people as a hypnotic. As far as I'm concerned, it's the pharmaceutical version of Muscimol, the chemical in the Amanita Muscaria mushrooms, because having tried both I can confirm they have pretty much 99% the exact same effects. That drug made me a better person, opened up my mind, showed me my wrong doings, gave me more empathy. It allowed me to be more creative, it allowed me to be social, it allowed me to expand my consciousness, as hippie as that sounds. Zolpidem, among a few others, is my proof that pharmaceutical drugs are not all bad for you and in fact many can do a lot of good.
Of course though, they must be used properly, and this goes for z-drugs or benzos or opiates or anything that builds tolerance. If you put 3-4 days between using a substance, you will never become tolerant or dependent. It's good advice to take.