Having problems you haven't worked out and addictions to distract make it hard to focus on things. Get the problems worked out and face addictions. Trying to focus and getting to the bottom of what distracts you is a way to figure out these things.
Also if you can't focus on something, maybe it's not something worth focusing on.
And yeah, drugs of any kind shouldn't be habitual.
A big part of it is learning to engage yourself in things you aren't interested in.
Kids are supposed to be taught these skills while growing up (homework, chores, hobbies, etc). However, most just sit around playing videogames and social media so they struggle to pay attention to anything for more than 6 seconds at a time.
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