Nicotine does have a slightly fishy/ammonia taste.  I sometimes catch this on the exhale with unflavored juice.  Also a black papper-like tingle.  These tastes I think depend on how thick the juice is.  TW 36 mg uses more PG and a little water, and I get that peppery feel from it.  VT Vapor 35 mg using just VG is much less.  Both unflavored juices will give a very slight fish taste.  
If you have every used nicatrol inhaler, those cartridges give an almost strong fishy flavor from nic. I think they may be flavoring those now, worthless as they are...
	
		
			
		
		
	
			
			If you have every used nicatrol inhaler, those cartridges give an almost strong fishy flavor from nic. I think they may be flavoring those now, worthless as they are...