French inhaling is when you pull the smoke from the blunt or w.e you're smoking out of and keep it in your mouth.. then open your mouth a bit and push the smoke out and inhale through your nose at the same time.. the smoke should make a "Bridge" like form as its passing from your mouth up into your nose.. its cool.. now the other double exhale is easy.. I first exhale through my nose then just open my mouth and exhale through there.. and keep on and smoke comes out my nose and mouth.. it's easy.. What's hard is blowing smoke upwards out the left corner of your mouth and blowing smoke downwards out the right corner of your mouth. lol that's hard.