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.
HOW TO AVOID: Proper industrial hygiene practices should be followed, such as appropriate.[12] Mica use in cosmetics is not a concern for consumers. References. [1] Skulberg KR, Gylseth B, Skaug V, and Hanoa R. âMica pneumoconiosis â a literature review.â Scand J Work Environ Health. 1985 Apr;11(2):65-74.