i prefer meditating sober or while tripping, weed makes my head too foggy and makes my attention span too short to sit there and clear my mind.

but uh. just close your eyes, put some headphones on with music, and sync up your breathing with the music (aka, inhale/exhale every other measure), focus your thoughts on one thing, i find it helps to chant a mantra (even if its a meaningless sentence, like when i was listening to no quarter by led zeppelin i made up "there is no quarter in the forter"), helps clear your mind and focus you on just chanting that.

after about ten minutes you can stop chanting, but try to keep your breathing on beat with the music (and gradually slow it down, inhaling every 3-4 measures and then exhaling, etc. deep slow breaths).

once you clear your mind, you will be left in a very calm, blissful state