Friend turns green after 3hits
So its been a while like a year since my friend has smoked weed.So its 420 and we start the day in the morning smoking some weed, that was around 8am, then at 12pm we get another hit, but then my friend gets to hits from a bong and he turns GREEN!!! his face turned pale and green, he felt horrible and could not walk, he was like that for 3hours. So why did he turned green?