there is no substance or entity known as "salfas." It's possible that new information or discoveries have emerged since then, but as of that time, "salfas" was not a recognized term or known to have any effects on humans.
If you meant to refer to a different substance or entity, please provide more context or clarify your question, and I'll do my best to provide relevant information. Additionally, if you suspect any substance or chemical could be harmful to humans, it's essential to consult with qualified medical professionals or experts for accurate and up-to-date information on potential risks and effects.