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I'm still a little worried about the toxicity of graphene-based products that they might turn out to be another "asbestos".

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Asbestos is entirely safe as long as it is non-friable. If graphene has similar risks it should also have similar safeties. Don't huff graphene dusts.

is there any reason to be concerned about graphene that wouldn't apply to common pencil lead (graphite)?

Usage duration and frequency?

Only on HN are graphite pencils used less frequently than graphene tech.

Well most people use pens instead of pencils.

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