{"hq_id":"hq-p-spe-000188","name":"Cannabis Flower (Dried Marijuana Bud, Pesticide Residues, Heavy Metal Uptake, Aspergillus Mold Contamination)","category":{"primary":"cannabis","secondary":"cannabis_flower","tags":["cannabis","marijuana","flower","bud","pesticide","heavy metal","mold","Aspergillus","THC","mycotoxin","lead","inhalation"]},"product_tier":"SPE","overall_risk_level":"high","description":"Cannabis flower (dried marijuana bud) is consumed primarily by smoking or vaporization and presents a unique toxicological profile because cannabis is a bioaccumulator — the plant concentrates heavy metals, pesticides, and mycotoxins from soil and growing media at rates exceeding most agricultural crops. Lead and cadmium accumulate in cannabis leaves and flowers at 2-10x soil concentrations, and because combustion does not destroy heavy metals, inhaled smoke delivers these contaminants directly to pulmonary alveoli with ~50% systemic bioavailability. Pesticide contamination is a persistent problem in both legal and illicit markets: myclobutanil (Eagle 20), a common fungicide, thermally decomposes to hydrogen cyanide when smoked. Aspergillus fumigatus and aflatoxin-producing molds thrive on improperly cured cannabis, posing lethal risks to immunocompromised patients using medical marijuana. Unlike tobacco, cannabis has no federal quality standards in the US, and state testing requirements vary dramatically — Oregon tests for 59 pesticides while some states test for fewer than 20. Cannabis cultivation operations have been documented using banned pesticides (carbofuran, dichlorvos) that would never pass food-crop inspection.","synthesis":{"derived_risk_level":"moderate","synthesis_confidence":0.622,"synthesis_method":"compound_composition","context_used":"human_adult","context_source":"product_users","exposure_modifier":1,"vulnerability_escalated":false,"escalation_reason":null,"compounds_resolved":2,"compounds_total":2,"synthesis_date":"2026-05-09","synthesis_version":"1.2.0","methodology_note":"exposure_modifier and adjusted_magnitude are computed from ALETHEIA-calibrated heuristics (route × duration × frequency multipliers, clamped to [0.5, 1.4]). Multipliers are directionally informed by EPA Exposure Factors Handbook (2011) and CalEPA OEHHA but are not regulatory consensus. See /api/methodology for full disclosure."},"hazard_summary":{"sensitive_populations":"immunocompromised patients (Aspergillus risk — potentially fatal invasive aspergillosis), chronic daily users (cumulative heavy metal burden), medical marijuana patients relying on contaminated products, pregnant women","overall_risk":"high","primary_concerns":["Cannabis hyperaccumulates heavy metals (lead, cadmium) at 2-10x soil concentration — inhaled directly via smoking","Myclobutanil fungicide decomposes to hydrogen cyanide when cannabis is smoked","Aspergillus mold contamination poses lethal risk to immunocompromised medical patients","No federal quality standards — state testing requirements vary from 13 to 66 pesticides"],"exposure_routes":"Inhalation (primary — smoking or vaporization delivers contaminants directly to alveoli). Ingestion (edible preparations concentrate fat-soluble pesticides)."},"exposure":{"routes":["inhalation","ingestion"],"contact_types":["inhalation_combustion","inhalation_vaporization","ingestion_edible"],"users":["adult","medical_patient","immunocompromised"],"duration":"chronic","frequency":"daily_to_weekly","scenarios":["Smoking cannabis flower contaminated with myclobutanil — thermal decomposition releases hydrogen cyanide at combustion temperatures","Immunocompromised medical marijuana patient inhales Aspergillus spores from inadequately tested flower","Chronic smoker accumulates lead and cadmium from bioaccumulated heavy metals in cannabis plant tissue","Consumer purchases from unregulated market with no pesticide or heavy metal testing"],"notes":"Cannabis bioaccumulation: demonstrated hyperaccumulator for Pb, Cd, Cr, and Ni — originally studied for phytoremediation of contaminated soils. Myclobutanil: approved agricultural fungicide but produces hydrogen cyanide (HCN) when heated above 300C during smoking. Aspergillus: A. fumigatus, A. flavus, A. niger found in 5-20% of tested cannabis samples depending on jurisdiction. Aflatoxin B1 (IARC Group 1 carcinogen) produced by A. flavus on improperly stored cannabis. State testing variation: OR tests 59 pesticides, CA tests 66, CO tests 13. No federal standards under CSA Schedule I status."},"consumer_guidance":{"usage_warning":"Purchase only from licensed dispensaries in states with robust testing programs (CA, OR, WA). Request certificates of analysis (COA) showing pesticide, heavy metal, and microbial testing results. Immunocompromised patients should ONLY use irradiated or tested-clean cannabis products — Aspergillus can be fatal. Vaporization at controlled temperatures (180-210C) reduces but does not eliminate combustion byproduct exposure compared to smoking.","safer_alternatives":["Lab-tested cannabis from licensed dispensaries with full COA transparency","Vaporization at controlled temperatures instead of combustion (reduces PAH exposure by 80-95%)","CO2-extracted concentrates (solvent-free, tested for residual contaminants)","Edibles from licensed producers with pesticide-free flower inputs"]},"regulatory":{"applicable_regulations":[{"jurisdiction":"USA","regulation":"State Cannabis Testing Requirements (No Federal Standard — CSA Schedule I)","citation":"State-specific: CA BCC Regulations Title 16 Div 42; OR OAR 845-025-5500; CO 1 CCR 212-3","requirements":"No federal quality standards exist for cannabis under Schedule I classification. State-legal markets set individual testing requirements: California mandates testing for 66 pesticides, heavy metals (Pb, As, Cd, Hg), microbial contaminants (Aspergillus, Salmonella, E. coli), and mycotoxins (aflatoxins, ochratoxin A). Oregon tests 59 pesticides with some of the strictest action levels. Colorado tests only 13 pesticides. Action levels and testing frequency vary significantly between states. No inter-state harmonization mechanism exists.","compliance_status":null,"effective_date":null,"enforcing_agency":"State cannabis regulatory agencies (CA BCC, OR OLCC, CO MED)","penalties":null,"source_ref":null}],"certifications":[],"labeling":{"required_disclosures":[],"prop65_warning":{"required":null,"chemicals":[],"endpoint":null,"notes":null},"ghs_labeling":{"required":null,"signal_word":null,"pictograms":[],"hazard_statements":[],"notes":null},"hidden_ingredients":{"trade_secret_protected":null,"categories_hidden":[],"estimated_count":null,"known_concerns":null,"notes":null},"notes":null},"recalls":[],"regulatory_gap":null,"notes":null},"lifecycle":{"recyclable":false,"disposal_guidance":"Dispose of unused cannabis flower in household trash mixed with undesirable material per state regulations. Do not compost if pesticide-contaminated.","hazardous_waste":false,"expected_lifespan":"6-12 months if properly cured and stored in airtight containers away from light and moisture"},"formulation":{"form":"varies","key_ingredients":[],"certifications":[]},"materials":{"common":[],"concerning":[],"preferred":[]},"compound_composition":[{"hq_id":"hq-c-org-000081","compound_name":null,"role":"active_constituent","typical_concentration":"THC 15-30% in modern cultivars; primary psychoactive cannabinoid; combustion generates tar, CO, PAHs"},{"hq_id":"hq-c-ino-000001","compound_name":null,"role":"bioaccumulated_contaminant","typical_concentration":"cannabis hyperaccumulates lead from soil at 2-10x concentration factor; inhaled via combustion with ~50% pulmonary bioavailability"}],"identifiers":{"common_names":["cannabis flower (dried marijuana bud, pesticide residues, heavy metal uptake, aspergillus mold contamination)"],"aliases":[],"manufacturer":null,"brands":[]},"brand_examples":[],"brand_examples_disclaimer":null,"sources":[{"type":"expert_curation","name":"ALETHEIA Safety Database","date":"2026-03-26"}],"meta":{"schema_version":"4.0.0","last_updated":"2026-03-26","timestamp":"2026-05-14T01:31:38.954Z"}}