My friend has smoked DMT + harmalas in the shower, but we do have a 5x5 steam shower with two shower heads, and he said he was sitting down the whole time.

I wuold only say smoking DMT in the shower is safe if you can sit down without the water running on you blockin your nose or whatever.

even then a sitter would be good.

Apparently quite a mystical experience, being in that water world.