Understood - but with an atty such as the RM2, the
juice never sits on metal, correct?
I don't know anything about the RM2... decorations are never a problem (unless you suck on them a lot). The problem would be if there's a break in the plating somewhere (drilling would do this...), and THEN PG and VG (which are really efficient liquid solvents and extractors) sits on that exposed copper or zinc dissolving the metals into solution.
If copper or zinc are not exposed to pg/vg that you plan to inhale, there shouldn't be a problem. Copper and zinc are used in nearly everything, they aren't scary. They are only scary in excess, taken internally. But soaking e-juice inside an atomizer with exposed copper and zinc, then
vaping it into the lungs is taking it internally.
There's only 2 things I worry about, That's plated atomizers which can damage over time, and plastic/poly tanks which can be melted by certain juices. I solve that problem by having mostly glass and stainless atomizers. But I do still have some poly tanks and some plated atomizers. I just don't use those all the time. I still like looking at them, and I don't mind having them. Oh... 3 things, I don't like silicone wicks either... but I've used them in the past, and may use them again. It's like anything else, minimizing risk, not eliminating it.
And like someone else said, I smoked for a very long time, my lungs are probably black, and NOTHING in vaping could be as dangerous as what I had already done to myself over time (well, cept for vaping copper, silicone, plastic directly - which you are not doing even with these elements in your tank). So long as everyone's aware of the risk, it's your life, your lungs, your choices

. I only brought it up because it didn't seem certain that everyone was aware of the risks they were taking.
Oh wait, there's a 4th thing, I am concerned about additives and potential chemicals in flavor concentrates. But for the most part, food safe is OK, and there, nothing in food safe flavors can rival the risks in the 400+ chemicals in cigarettes.