how do i tell if my cat is barking/coughing or gagging?

it sounds to me like a bark. hes never made this sort of noise before. we went away for two nights on a fishing trip, first time leaving them alone. we paid my sister and boyfriend's brother who are going out to watch them. they stayed in our home, and i can smell that they were smoking in here against our rules. what could be going on? was he hurt? if he was kicked would this happen? could it be from the smoke? i'm worried. this just happened 5 minutes ago.
oh, that looks confusing. when i say them when referring to the cats i mean the cat who is coughing or gagging and his brother. his brother is not coughing.
 
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