I don't recall all of the chemicals off the top of my head, but it's not "like" a drug. It IS a drug -- actually more than one. It's a real thing that is happening in their brains. There's legit research that has been done on it.
It's hard, for me at least, to empathize and understand what that must be like (like Kaizen, I haven't done any drugs), but reading about it may help a little.
