The average typing speed is 38-40 words per minute (wpm) for adults  in a professional working environment (despite many incorrect  reports on the web that it is 50-60 wpm).
Chronic Health Effects The following chronic (long-term) health effects can occur at some time after exposure to Mica and can last for months or years: Cancer Hazard * Some Silicas have been shown to cause cancer in animals. The risk of cancer in humans from Mica is unclear at this time.
Untreated or mildly treated mineral oil is indeed considered toxic to humans, according to the World Health Organization. But highly refined mineral oil, as used in Vaseline and lip balms, is classified as not suspected to be carcinogenic but more information is required before it can be labeled as harmless by WHO.