You can get used to any smell given a long enough exposure. Ever been to someone's house that just reeks of dog or cat? Beyond that, it can happen in an acute

You can get used to any smell given a long enough exposure. Ever been to someone's house that just reeks of dog or cat? Beyond that, it can happen in an acute sense as well. Hydrogen sulfide becomes undetectable above a certain exposure. You will usually pass out shortly afterwards (and then die because hydrogen sulfide is heavier than air and you are now on the floor). The standard advice given for people who enter confined spaces is that if you smell hydrogen sulfide (rotten eggs) you should be aware and check your sniffer. If you are still in the confined space and you suddenly stop smelling rotten eggs, you are literally seconds away from dying and should retreat to fresh air immediately or deploy SCBA.