I reminisce on park jams, my man was shot for his sheep coat
Childhood lesson make me see him drop in my weed smoke

from Nas – Memory Lane (Sittin' in Da Park) Lyrics on Rap Genius

When Nas is in the thoughtful state that smoking weed can create he still vividly remembers (‘sees’) his friend’s death

This is backed up by the idea that this was a ‘childhood lesson’ — it still stays with him to this day

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