Gift ideas for a teacher?

I’m looking for a gift idea (birthday )for my physics teacher , he’s 50 years old , Aquarius man , heavy smoker and kinda genius . No specific budget


Bring him a grilled cheese sandwich.


A vape kit


I would go with something cute- if you look on, you might find things with physics sayings or expressions. I know someone who has a t-shirt like that, and I think there are coffee mugs, too, which would be safer since you don't have to worry about size. Here's a link-