I guess it really does boil down to personality compatibility and mutual respect/understanding that all parties are on the same page. Took me over 8 years and I thought I had a reliable snowboard buddy, but that damn weed was more important than a season pass so back to square 1 with that one. I really don't need gas money that bad to get to the hill. Looks like hunting is no different.
As far as weed/alcohol/impairment goes I refuse to handle firearms if I'd had a drink and I will leave if those around me are handling firearms while impaired. I think society will only get dumber and dumber once weed is legal. I don't dispute the medical benefits of cannabis products but regular recreational marijuana users simply will never have the same drive and motivation in life as those who don't smoke it.
Willie Nelson, Snoop Dogg, Lady Gaga. All pot heads. Brad Pitt, Matt Damon, Johnny Depp. All pot heads at one point in the past (potentially still). John Stewart, Stephen Colbert, Rush Limbaugh, Bill Gates, Labron James.... I could go on, but you get the point. Smoking pot can make you lazy in the here-and-now, but it does nothing to impact your drive or motivation in life long term. Anyone whos going to become a deadbeat from pot would get there just as well with alcohol or cigarettes and coffee.
Furthermore, legalizing marijuana isn't going to make everyone start smoking it. Those who want to smoke it already do. I know a lot of people who smoke weed, and quite a few who have quit smoking it, and guess what? None of them quit because its illegal. The legality of it (especially in large urban centers) is a complete joke as is. I can literally walk into a store and buy weed now.
The only big difference legalization is going to do is add revenue for the government(and other legitimate businesses), while undercutting revenue streams for organized crime.
To me, its all about moderation when out in the woods. Just like I have no issues with a beer at lunch, I have no issues with a bit of pot at appropriate times. For a regular user, a quick toke is comparable to having a cigarette IMO - no long lasting inebriation, just a few minutes of relaxing mellowness and maybe heightened focus for 5 or 10 minutes. That said, smoking a fat doobie to yourself in a tree stand is irresponsible and unacceptable - if you wanna get baked (notably high) then you need to do that without guns around.