In my experience: you develop a tolerance over time, and as you grow accustomed to how your brain behaves on it, it becomes possible to partake in productive activities (reading, writing, programming, holding up a fairly deep conversation, etc.)

Strain, dose, method. All have a big impact on whether you're left in a productive state or if it's time to get some chips and netflix

And as with any substance (or activity in general), environment matters a lot.

Hanging out on the couch at home? Probably fitting to crash soon.

Out at the park with a book? Read until you realize you're burning.

How do you not code while high?!

You get tunnel-vision and become a super-abstract thinker. Code is just made up abstractions and being high often involves vivid, creative imaginations. You combine the two and literally anything is possible and it's awesome.

Replace all the "yous" with "I" and the conversation becomes a whole lot clearer (and more factual).

Things affect people differently! It can even affect the same people differently at different times. Sometimes weed helps me to focus on things, other times it puts me on the fritz. Sometimes it wakes me up and others it knocks me out in minutes.

I was joking :) I totally understand. You're right though, I should have said "I"