As for Froome, he took too much asthma medication. It is debatable whether it has any profound effect on his performance. He exceeded the maximum amount allowed for a "rescue" inhaler. From what I understand from my pulmonologist, this is not really a big deal. It's an arbitrary maximum amount set. Also, had he been overusing a long-acting asthma medication, like Advair or Symbicort, that would have been bigger issue.