Read The Fine Article a bit more closely. It contains the answer to your question.
In one paragraph they talk about treatment using of purified cannabinoids, in the next about THC isolated alone, while in the paragraph after they start talking about marijuana being classified as a Schedule I drug and then shortly after about the legalization of marijuana.
Ah. In that case, this research was already done with extracted compounds. The mice were not smoking. I'm sure that medically, if this were ever to be a treatment, it would be done through refined compounds as in the study, not by simply smoking. Medically it would be crazy to leave dosage to such an unreliable method.
As for this being used to argue in favor of smoking, well, it's a grave mistake to hold back science because somebody, somewhere, might use it to poorly argue for something. There's always some way something could be misinterpreted. Besides, per my previous point, if you want to take advantage of this smoking just isn't the way to go, and it's especially not the way to go if you're just smoking "something" with no idea how much of the relevant compounds is in it, or at least not enough of an idea. On the cost/benefit analysis, with "better brain cancer treatment" on the benefit side, potentially, I need to see some costs a great deal more significant than "somebody may use this to argue in favor of smoking pot", which "potheads" do at every available opportunity and more anyhow, before I start to worry.
Unless we finally redefine what "medically" means. "One-size-fits-all" is not necessarily the most effective way to treat medical issues, either. When it's in the context of pain relief, smoking/vaping is the easiest way for patients to manage their pain without getting "too much" or "too little" from other methods available. Medicine is starting to enter the age when solutions tailored to specific bio-chemistries are available.
he meant 'read the fucking article'