My brother's old apartment always smelled like Indian food and marijuana.

It was the people upstairs.
If you've checked everything out, it sounds like it is something outside your apartment. May I suggest some Oust air deodorizer?
Runaway from the smell.
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“I've learned that people will forget what you said, people will forget what you did, but people will never forget how you made them feel.” ~ Maya Angelou
Karma is a boomerang.
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