is it less secure to run the onion (TOR) protocol on a virtual machine running on a host with an ordinary Internet connection?

is it less secure to run the onion (TOR) protocol on a virtual machine running on a host with an ordinary Internet connection?

I'm thinking in an analogy of the Postal Service. If you mail a package of drugs with an encrypted return address, it does not seem secure to send it through the US mail in another envelope with a plaintext return address.