This app was mentioned in 5 comments, with an average of 1.80 upvotes
https://play.google.com/store/apps/details?id=lolbellum.druglog
I have everything besides my daily weed use logged from Jan 1 this year.
Shitty app that does this which I made a few years ago. I haven't worked on it since then but here it is https://play.google.com/store/apps/details?id=lolbellum.druglog
There is an APP for keeping drug logs.
https://play.google.com/store/apps/details?id=lolbellum.druglog
"Drug Log" Google Play Store, don't know if have for iOS
https://play.google.com/store/apps/details?id=lolbellum.druglog