I've been getting into zen buddism. I have been meditating on my own. 10 minutes here and there. i visited a zen buddist sitting today and a monk was visiting. we did 25 minutes of meditation. walked round. did some other stuff tjen did another 25. in zen buddism you meditate eyes open. in the last 25 minute sitting. I zoned out pretty hard. when I started to come out of it. all I saw was smoke until I came too and it all cleared up.. it happened 1 more time before it was over. It looked real. my question is. jave any of you that practice meditation experienced this too? any idea what that's about? kinda freaked me out