I don't know what it is...maybe those who smoke pot don't notice it...but those who don't can smell it a mile away and I have yet to meet anyone who thinks it's a good smell. It "carries" way more than cigarette smoke.
Then again, they weren't any worse than the group of 10 or so that weren't catching anything and abandoned their fire on the ice to stroll through our string of tip ups and then set up 20 feet from us after asking us what was working.
But I digress. I don't want to diminish the spirit of this thread.