The usual conspiracy theory BS.
Meanwhile, back in the real world:
"a 2011 review of 26 studies on the effects of inhaled beta-2 agonists found that the medications did not improve “endurance, strength or sprint performance in healthy athletes.” In another study published in 2011, Belgian researchers wrote that taking salbutamol “does not affect exercise capacity in normal subjects.”"
Show me a research trial that establishes that there is any performance benefit from using a Ventolin inhaler.
On the other hand, "performance-hindering side effects include dizziness, headaches, and nausea".
http://www.physiology.org/doi/full/10.1152/jappl.2000.89.2.430
Increased Vo2 would be my choice as to why it is so popular.
https://www.ncbi.nlm.nih.gov/pubmed/8236068



