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No, I believe cancer from hair dyes was caused by touching dye during application. Poisons are volatile, dye is only toxic, while it is drying.

Tattoo pigment particles are quite inert.

> Tattoo pigment particles are quite inert.

Asbestos is quite inert, which is a good property for fire retardant materials to have. However it does have an unfortunate effect when inhaled.

How do you know they are inert? The ingredients are mostly unstudied and unregulated.

If they weren't (mostly) inert, I guess they would do a poor job at staying in place, which is the whole point of tattoos.