These snails have a very complex venom that is among the most deadly venoms for humans, rivaling several of the most venomous snakes. However, scientists have also started exploring potential medicinal uses for various parts of the venom.

Dutertre et. al. writes more about that here. The human lethal dose was estimated Dutertre and colleagues in another article.

And, as is usually the case, the Wikipedia article on cone snails is an interesting read.

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Dutertre et. al. (2013) “Deep Venomics Reveals the Mechanism for Expanded Peptide Diversity in Cone Snail Venom” https://doi.org/10.1074/mcp.M112.021469

Dutertre et. al. (2014) “Intraspecific variations in Conus geographus defence-evoked venom and estimation of the human lethal dose” https://www.sciencedirect.com/science/article/abs/pii/S0041010114003262

Wikipedia “Cone Snail” https://en.wikipedia.org/wiki/Cone_snail last accessed 6. february 2021