A pointless example, being that the act of robbing a convenience store is in and of itself a crime with a direct victim. For this scenario to be in any way relevant to our discussion here, you'd have to prove that the act of an adult purchasing marijuana from another adult and consuming it in private is, in and of itself, a crime with an obvious, direct victim. The government hasn't had any luck trying to "prove" that for the past fifty years or so, so I'd imagine you won't fare much better.
Nevertheless, that was not the issue. See my post #169:
"My point was only to illustrate that petty criminals of all types can, and do, come in contact with more experienced criminals. I don't believe that the answer is to legalize the petty crime."
The post was not about the nature of the crime, just the criminal association.