Dirt substrate?

[boosh96]

I've been thinking about switching out my snake's aspen bedding in favor of a topsoil/sand mix or some other soil mix. This may be a dumb question, but is there any issue with doing this? Our snakes include a corn snake, a Dumeril's boa, a Colombian BCI, and a ball python. Would the Dumeril's boa and corn snake just need a dryer dirt mix than the python and the BCI?