Per this 2011 article (http://www.nytimes.com/2011/09/28/business/media/researching...), Kleenex has a 47.1% share of the facial tissue market. I assume these numbers reflect the U.S. (rather than global) facial tissue market.
Per this recent article (http://www.macrumors.com/2015/09/03/iphone-us-market-share-c...), Apple has a 44.2% share of the U.S. smartphone market.
Although the text of the article doesn't say it explicitly, the title of this article effectively screams "Apple isn't well diversified! Its making too much money on one thing!" I really don't see the sky falling here by any means. Barring a seismic shift in the smartphone market, Apple will continue to dominate the smartphone market, making obscene amounts of money; they will probably also continue to innovate. And Kleenex will continue to dominate the facial tissue market.