High subsides after maybe an hour if you want to stop
Probably causes brain tumours
These thc vapes been around for years, theres many brand that do them brass knuckles, mario carts, kurvana, king pen, dank vapes etc…. Only issue is most are black market and have all kinds of shit in them. However if you find someone legit who extracts them personally and then fills carts without cutting it with all kinds of PG or VG shit then its probably the cleanest way to toke.
Edit: Whats the correlation between single use and a tumor?