[googleli]

I usually couldn't care less and smoked with my Westone 3, TF10 Pro, ER4P etc... But I hesitated with CK100 which I liked so much and UE 18 Pro... which is so expensive... 
 
Could any smoker say that their IEMs have deteriorated since they have smoked quite a bit with the IEMs inside their ear canal? Has any of the IEM manufacturers issued anything about the effect of smoking on the IEMs? 

 

[PANGES]

I don't see how they would mess up your IEMs too much other than making them smell funny. I hate to be that guy, but your lungs will probably form cancer before you notice any audible damage to your IEM's. 
 

 

[ClieOS]

Unless there is hole in you eardrum, smoke can not get into your ear canal.

 

[niechen861102]

I hate to be that guy, but your lungs will probably form cancer before you notice any audible damage to your IEM's.
 
 
 
 
 
 
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[GoldBug]

I've had a cigar or cigarillo on occasion with IEM's in - the seal on the ear canal seems to suck the smoke into the eustachian tube and irritates it.  I try to avoid it.  Plug-ins like triple flanges are worse than customs.
 
I doubt it will adversely affect your monitors.
 
Unless...   Does smoke come out your ears when you have a cigarette??