If you do a Google search you can see the guys at puff it up do a tear down on the starry.
I don't think it's too good to be true but you really do get what you pay for - i dont think I'll ever consider this piece medical grade. I don't believe it's advertised as being so (Just saying this to cover my own back, I'm mentioning medical grade because safety of materials is in question) but I see this as one of the better budget vapes available.
From the teardown I can see one piece of material that I'm not 100% sure what it is -it seems to be the insulation for the ceramic oven. It's black and seems to have a texture like felt or cotton. Because i dont know exactly what that is I can't personally say it's 100% safe. I don't believe anything is ever 100% safe, freak accidents happen. Especially when you/we/I get complacent.
I don't think air flows past the 'felt' piece. The way i see it is that it comes in through the holes on the side underneath the chamber and up. It may go past some silicone. It doesn't really concern me much. The safety of the starry doesn't concern me at all personally, I would definitely buy another and I gave a friend one for Christmas. I wouldn't gift a lot of vapes but this sits in that perfect price range no frills checks the list vape. Wouldn't gift anything I have safety concerns over.
I think one thing though if the guys at puff it up took the vape apart and they definitely saw the part I'm talking about and the rest of the parts and nothing raised a concern with them that's good enough for me - I know they have had vapes that they refused to stock because of what they found in their teardowns.
Additionally I believe
@stickstones gave some feedback regarding the starry quite early on in the design/production phase (I'm sure there's other beta/reviewers who contributed too) and to top it off planet of the vapes have their own rebranded version of this piece (more discreet/different logo) that takes a lot of investment and of they're willing to do that. It's more reassurance for me.
I guess I'm putting a lot of faith in to these companies. We all do and I mean nothing is 100% safe in the way that I could get hit by a bus tomorrow - I still look both ways when crossing the road though so this could be your equivalent of looking both ways.
If you're really concerned then save and have a look at your options, if it's the choice between another starry as a backup/second vape or something else then I personally would say something else, I feel that vapes have different signatures or profiles and it's easy to get used to them. I like to switch it up. I have a dynavap which is my absolute rockbottom - backup pretty much just stainless steel. There's a lot out there. I wish I could say yeah 100% safe no doubt but as I said I honestly don't think that exists. 99% maybe? Not 100% our good friend chaos has a huge part in that.