Oops, it doesn't look like 'vape in day' is a national day..

Other days

boy friend

Boy Friend Day
coffee

Coffee Day
offer

Offer Day
eat what you want

Eat What You Want Day
slime

Slime Day
ruby

Ruby Day
frozen yogurt

Frozen Yogurt Day
lisp

Lisp Day
singles

Singles Day
promposal

Promposal Day