Honestly I wouldn't worry about cross tolerance. Given you done it years ago and only occasionally, shouldn't make much a difference. Fentanyl/nitazenes are strong enough to kill even those with the strongest tolerances, and we're talking taking the entire gram or two (1000mg/2000mg) instead of just their recreational dose.
Also I wouldn't worry about not knowing what your getting. It may not be pure nitazene yes. But it most likely is, or close enough -- remember, there is a review system. Even if its not pure and mixed with other stuff, it doesn't matter, you will be taking a large enough dose anyway to kill many people.
Grapefruit just increases the strength of most drugs. It allows them to be in your system for a longer duration. I wouldn't worry about it, with opioids this strong you probably don't need to worry about anything else.
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I'll put a quick DW guide here for yall.
0. Read
darknetbible.info
1. Get a USB Stick (YOU MUST DO THIS. DO NOT ATTEMPT TO MESS AROUND WITH DW ON WINDOWS OR MAC)
2. Install TailsOS on the stick and make it bootable
3. Restart your device and boot into the USB. You will now boot into the TailsOS inside of the USB
4. Wait till Tor Browser loads, open it, and go to tor.taxi. From there, go to the "Drub Hub" market link.
5. You will need to learn PGP encryption.
- Most markets login system is: they ask you for your public key (what people use to encrypt a message just for YOU)
- They give you a big blob of text that has been encrypted with your public key. You put it into your PGP app on TailsOS (Kleopatra), then decrypt it with your private encryption key that is tied to the public key, so any message encrypted with your public key can only be decrypted by you.
- On kleopatra, you will need to make your own secret/encryption key first on the app, make sure to not put any identifying information (random name + nonidentifying email, doesn't even have to exist)
6. I'd also go on Dread, there are subdreads there relating to PGP practice as well.
7. You don't have to make an account on DrugHub right away, you can browse and find the substance then make an account once your ready
8. As for buying crypto, buy LTC (Litecoin) on Exodus or Phantom wallet (Stay off Coinbase), then move it to a Cake Wallet. Then from Cake Wallet, swap your LTC to XMR (Monero). XMR is safest for purchasing.
9. After you made an order and send the XMR to the address it says, wait for shipper to ship. Always encrypt your name (USE REAL NAME TIED TO YOUR ADDRESS, RANDOM NAMES ARE SUSPICIOUS) and address with the sender's public key, so only they can decrypt it. If the market is hijacked by governments in the future, they may have access to all plain text messages, so you must never send messages in plain text (only PGP encrypted)
10. If in the US you can use USPS Informed app to track all mails and packages coming to your house. They may not send you the tracking right away, so watch your mailman if you don't have access to USPS Informed/in USA. NEVER go to usps tracking, especially on the clearnet. It would make you a lot more suspicious. Frequently tracking your order flags the package. Instead, AT most, use a site like 17track or something random like that, and only do it on a VPN, so it can't be tied back to you, and again, don't do it frequently.
If anyone has any questions, feel free to ask me here. I will not tell you what the name of the seller on DH is though, you will have to find it yourself.