Trig, you are right - asthma can go undiagnosed. Also, yes, if you have a cold with lung congestion, the non-congested bronchioles will dilate as a reflex, so the ventolin has no scope to do anything. I may stand corrected over ventolin not making breathing easier if you have no...
Interesting thread. Some comments
1. Salbutamol ('chemical' name) is Ventolin (trade name) like 'crisps' and 'Golden Wonder'.
2. It is a beta2 agonist which means it mimics the effects of the body's adrenaline (a blood borne chemical) or noradrenaline (a similar chemical released from...