hit or miss. sometimes it makes me more cautious, and the idea of hitting jumps at a hard speed and throwing down in the air is initimidating. but if I just push myself beyond that (usually just the first hit of the day) I'm relaxed and playful on skis. Better to do it after a few good runs rather than smoking on the way to hill if you want to be productive
I did my first backflips (and all of them) when friends and I spend hours smoking and building jumps. and usually not even into powder.
you can move beyond it, all I'll say is skiiing stoned is better than skiing wasted (unless ur just hammered and fucking around on groomers--I stay the hell out of the park when I'm drunk)