Okay, so, it's 100% canonical that Sherlock Holmes only does drugs when he's bored due to not having a case or anything better to keep him entertained. That's just a fact, that's how it's written in the text of the original stories.
Ergo, I think that means, in modern adaptations of these stories, the absolute last thing Sherlock should be doing is drugs. Because we have so many more things we can do for fun now than we did in Victorian England.
And, given his interests in learning, justice, good food, and music, I'm gonna go out on a limb and say that, for just day-to-day entertainment, he probably still has his violin, and also subs to a LOT of musicians on YouTube, along with following a few vlogs/blogs that review restaurants, and has subscriptions to just... so many academic journals. These are the things he turns to in the quiet moments of his cases, as well as taking Watson to various restaurants they like and attending concerts as they do in canon.
When he hasn't got a case and is bored, however?
No, not drugs, but a darker, more sinister addiction, one perfectly tailored to his longing for justice and preventing misinformation, that leads to greater knowledge for all being available at the fingertips of all, from all walks and ages of life, the unifier, the equalizer, the bastion of education that comes daily under threat that would see harm done to those they do not know.
In other words, he's a Wikipedia editor.
And he's a godsdamned demon about it.
He doesn't go on Twitter for similar reasons he's not fond of the country - there's simply so much misinformation and injustice going on there that he simply can't fix, so he does his best to put his efforts in places he can make a difference. As far as he's concerned, the only good thing that's come out of that website is community notes.
(Watson makes note of all these details in his personal journals, where he details all their more interesting cases as well. He's not sharing them at the moment, social media being what it is these days means Sherlock gets more than enough attention without Watson's help, but he wants to keep track of them for himself, and on the odd thought that maybe someone will find interest in them either quite late in or after Watson and Holmes' own lives.)
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