So many people get asthma but for most it's not life threatening. Some people are born with it, develop it their childhood or don't get it until they are middle aged. The drugs are so much better than they were 30 years ago. According to the evidence there is a limit on how much Salbutamol will help. The amount that Froome seems to be taking seems to be incidental. Regular asthmatics would take much more than that. Every second person seems to be puffing on an inhaler including sportsmen. But the thing with Salbutamol; is that the effect only lasts for a few hours at the most before needing more if you are still wheezing. In other words very handy for endurance athletes. For me it just regulated my breathing, in elite athletes who knows.