Lyric discussion by juvenilia 

Cover art for King lyrics by Years & Years

I feel like on the surface this is about drugs, but the drug is a metaphor for a person that creates an unhealthy relationship, but the singer keeps going back to anyways.

Don't wanna have to lose All that I've compromised to feel another high I've got to keep it down tonight

The writer probably made progress having detached themselves form the unhealthy relationship, and would lose that progress if they were drawn back to them again.