I'm not aware that any state requires pot shops to keep a record of whose IDs are shown. And even if they do, at least a gun-owning pot user has a choice under legalization.
I believe MA mandates ID and a computer record of your visit before you enter a legal shop. I think they have some reassuring language that they don’t maintain permanent records, but anyone who believes that is a fool. I see it like gun registration. The records just make it easier for them to “get you” later on if they decide that they want to know who their enemies are.
In MA they check your ID. Just as they do in a liquor store. I don’t think they are “tracking it.” Just as easy to grow your own and no one is the wiser.