if you are in HC...tough luck
They should really make them dropable after the quest is complete....
If they have weight, they aren't a quest item anymore and you can drop them.
It's not about the weight; it's about saving time scrolling through stuff. What they need to do is make them non-quest related after you complete the quest. I mean, I am running around with over 500 Rocket Souvenirs in my pockets even after completing the quest they are for. If they had weight, I'd be [censored].
Some of those items, however, are released from quest item status while others aren't even quest related at all.
The lighter can be dropped once you deal with Benny.
the cigarette butts aren't even quest related and can be dropped.
Motor-Runner's Helmet can be dropped after collecting the bounty.
Gecko Hides are also not quest related and are merely vendor fodder or used in a recipe maybe
lotto tickets aren't quest related
Rey's brain you need to take to Jacobstown to Dr. Henry with Rex in your party. If you never had Rex or started the quest "Ain't Nothin' but a Hound Dog" I don't see how you even obtained it.
Star Caps, while quest related, can be removed from the inventory by giving them to Festus (a fortune teller-type machine in the bottling plant)
Snowglobes... Really? You don't know what they are for? Do you like, never talk to any NPCs or what? :blink:
Marked Cards I am not sure about. I had them, but I never tried to get rid of them; plus the "quest" they are associated with is unmarked.
Everything else I would assume is for a quest if it's weightless and can't be dropped, or just junk if it has weight and can be dropped.