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    Disclaimer
    🧪 This is a research chemical with limited data on its long-term health effects, toxicity profile, and safe dosage ranges.
    ⚠ Synthetic cannabinoids are far more potent and unpredictable than natural cannabis. They lack a ceiling effect and have been linked to seizures, psychosis, and death.

    THJ-018 Well-documented
    Well-documented
    Multiple authoritative sources agree on dosing and effects.
    • 3 corroborating sources
    • 1 ROA with full dose ladder
    • duration data present
    • 27 combo interactions documented
    • toxicity data (PsychonautWiki)
    • classified Research-chemical

    Aliases: Sgt-17

    Research-chemical Cannabinoid

    Summary PsychonautWiki

    THJ-018 (1-​naphthalenyl(1-​pentyl-​1H-​indazol-​3-​yl)-​methanone) is a synthetic cannabinoid and analog of JWH-018. It has been marketed by many research chemical vendors as a legal alternative to the popular JWH-018, which had been banned in 2009. Its appearance is a brown, sticky and chunky powder.

    Dose Information dose.wiki PsychonautWiki

    ROA Light Common Strong Heavy
    Smoked 1-2mg 2-3mg 3-5mg 5mg+
    Light Common Strong Heavy
    Sources

    Smoked

    Dose ladder — dose.wiki, PsychonautWiki

    Onset, Duration & After-effects dose.wiki PsychonautWiki

    ROA Onset Peak Offset After Effects Total
    Smoked 5-10 min 60-90 min 5-10 min 60-90 min 2-3 hrs

    Tolerance

    Build-up develops over weeks of regular use via CB1 receptor downregulation
    Reset 2–4 weeks for most users; heavy users may need longer

    Tolerance Decay

    Full tolerance 3d Half tolerance 21d Baseline ~28d

    Effects dose.wiki

    Positive
    Negative
    Neutral
    Positive
    Negative
    Positive
    Negative
    Neutral

    Combinations

    Cross-Check THJ-018 with another substance

    THJ-018's nerd page Pharmacology, chemical data, effect profiles, and more
    →

    Helpful Links

    📘 Experience Reports 📖 dose.wiki 📖 PsychonautWiki
    Import into PsychonautWiki Journal

    The PsychonautWiki Journal app includes THJ-018, but its built-in data can be thinner than ours. Importing this file adds a separate "THJ-018 (Substance Search)" custom substance with our dose ranges, durations and tolerance, so you can log against whichever you prefer.

    ⬇ Download import file Import this file as custom substances and you get "THJ-018 (Substance Search)" with every route's full dose ladder and timeline, no typing. Works on iOS and Android (v15+); the format is confirmed by the app's developer.

    Ranges are harm-reduction guidance, not a prescription.