Can I use an inhaler for getting choked on smoke and when I have a shortness of breath caused not by asthma?

my fiance pops my zits and I get weak and out of breath. I was given an inhaler but I do not know when its best to correctly use one when I was not diagnosed for asthma or other respiratory systems. Got this inhaler from my fiance's mother whom does have asthma. I have small lungs smaller than normal. I get choked and can't breath in any kind of smoke whether it be from a cigerates or fire when camping. I just need to know when its best to use it because I don't have asthma and only get shortness of breath due to extreme pains.