He was friends with XXXTentacion and Lil Peep, both of whom were killed recently. The most famous ingredient in Lean is:

Read more here:

http://gematrinator.com/blog/index.php/2019/12/08/musician-juice-wrld-dies-of-seizure-age-21/

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he died 15 months 1 day after Mac Miller, another rapper, who died of an overdose:

Lil Peep died on 15/11.

his project with future, the lean one, released 1 year 51 days before his death:

He died 1 year 173 days after XXXTentacion: