Yeah the sand definitly stinks after awhile I have heard.
I am not an expert, but things between private hobbyists and vets can be vary different. Usually even reptile vets aren't well schooled in snakes, and their care is very different. But the good thing is there are a lot of vets out there who are outstanding with snakes. You just gotta sort through em!
Another thing that I have personally noticed is that even vets great with snakes or reptiles are great with their health issues, but most don't know much about husbandry although both things go hand in hand.
But anyways, no one regulates the pet trade from a product standpoint like the FDA does for food and such. There is no one out there to test these products in a lab controlled situation and give results. Unless the companies (which the good ones do) do the research themselves, or someone takes the task upon themself wanting to verify the product. Most things like cali-sand, reptile shed aid spray, vitamin sprays, etc do nothing at all and most animals are better off without them.
There is a lot of information out there, and some of the best comes from people on forums like this with years of first hand experience with your specific reptile. You have to know how to pick and choose whats right and wrong, especially at pet stores and mics. personal websites, even at the vets. Its hard but in the long run you normally get enough hard facts, data and info from someone to make their advice worthwhile and correct.
bmm