Sell it
"I just got back from a job interview and on my resume in the hobbies section I included the mathematics of blackjack. Lo and behold the interviewer asked about it so we talked about it briefly. Do you think that this is a risky thing to put on a resume as they could associate it with the bad connotations that come along with gambling?"
I remember reading in Olaf Vancura's own "resume", in his Knock-Out Blackjack book, that his course on gambling was the most popular in the university he was teaching. And I believed that! Getting the inside track on such a glamorous and sexy endeavor as gambling is indeed extremely attractive. We should know.
But it all depends on how you dress it up! It is no good writing on your resume "Hobbies : Gambling" or "Hobbies : Playing Blackjack". Hell, even me, I wouldn't hire you. I probably wouldn't even give you the chance to explain! (Why should I?? If you care enough about a job, you put the effort to have everything clear and in order.)
Now, I would give you a chance to elaborate if you'd put "Hobbies : Playing advantage Blackjack". It's still not perfect but I'd give you the chance to tell me whether this is about legitimate advantage techniques or some sort of TARGET. I'd also try to gauge how are you doing financially in your gambling endeavors, no matter what kind of player your are! Even if you are the best shuffle-tracker ever, in case you are losing big time, you are a liability.
...You don't believe that very good APs can be losing big time? You should.
What does it all mean ? This :
1. The general public is rightly weary and cautious about gambling and gamblers. The prevalent impression is one whereby people lose money -- period. You will have a hard time changing that perception and the time to do it should not be when you're out looking for a job. (Don't think you're compromising your integrity : it's not as if you pretend you're not Black, or Jewish, etc.)
2. The general public, at the same, is fascinated with gambling and its masters. Selling yourself as a master of advantage gambling and, specifically, as an innocuous and mostly theoretical student of the game is far more preferable. How about putting in there, "Hobbies : Theory of advantage gaming techniques". (What you've put in your resume, sounds good as well, but lose the word "blackjack".) This opens the way for some interesting back and forth with your interviewer, with your point being that it's practically all about studying. Yes, the white lie would be that, no, you don't spend anything near a lot of time in casinos. (It's true! If you are a good counter, you should be spending more time. No need to tell him that.)
Take care.
--Cyrus