You mean the Artemis series? I wouldn’t rely on trying to have 100% answer or expect them to be 100% even if they were supposed to, as effects can be individual. Just grow your listen counts daily, steadily and see how you react. Your own self-awareness and self-work are always important.
Artemis series are more safe than any other brain fields ever, but maybe if u smash too hard, you may still get some side effects. I went a little bit too hard with Valhalla vial (before release of the 2 newer ones), felt a bit overstimulation in some my nerves. Now with the 2 more, I seem to be able to loop till no end, but that’s not an encouragement.
Go like 10-15x a day at first, see how you react at 15. listen. You think you can handle much more? Try one more play and see how it affects you, watch yourself, and see. Without self-awareness and self-care, you’ll always run into a wall. Try stuff and experiment wisely.
For the cancer/tumour question specifically, if the answer is non-obvious, @anon61582445 or @Dreamweaver might step in. But otherwise, Captain made an effort to warn ppl, so that, despite we are getting stuff that gives us more possibilities, allows us to be “less responsible”, it doesn’t mean we should stop being responsible completely.
So the other thing, I’d advise you is try these two:
See how your brain feels with it, maybe use it for some time and if you still fear tumor-related side effects, keep them in your stack.