Poison, Again?
Did poisoning play a role in Napoleon’s death? A systematic review Daniela Marchetti , Francesca Cittadini & Nadia De Giovanni Clinical Toxicology Published online: 03 Dec 2020
Conclusions
Upon review of the contemporary and modern evidence, we classify Napoleon’s 1821 death as “unnatural” with massive gastric bleeding due to primary involvement of toxic substances that may have precipitated or exacerbated an underlying “natural” pathological condition or a disease as likely could be a stomach carcinoma; it does not imply criminal intent.
https://www.tandfonline.com/doi/abs/10.1080/15563650.2020.1843658?journalCode=ictx20
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It was shown that the climate on St. Helena was not particularly healthy (see the Boer POWs who were imprisoned there later), plus the mental results of his exile probably wasn't healthy for the Emperor either, though it doesn't constitute anything shady (some of the alternatives suggested for his treatment undoubtedly would have been worse). Conspiracy theories are unnecessary.