LONDON (Reuters) -Philip Morris International began selling its IQOS heated tobacco device in Austin, Texas on Thursday for $60 a piece, an executive told Reuters, kicking off efforts by the world's largest cigarette maker to build a market for its flagship heated tobacco device in the United States. Reuters reported in April that PMI was preparing for an Austin launch of IQOS, the top-selling heated tobacco device globally, but it has so far not been widely available to consumers. PMI said on Thursday that after a successful pilot it was now offering IQOS to smoking-age Austin residents and would host demonstrations and guided trials for adults at the Austin MotoGP Red Bull Grand Prix of the Americas to showcase the product.