The list should actually have said “dealing drugs”, not “taking drugs”.
Gianfranco Girotti, head of the Apostolic Penitentiary, is responsible for absolving Catholics from their sins.  He named the new mortal sins in an interview with the Vatican newspaper, L’Osservatore Romano.  He said the original 7 deadly sins had an individualistic dimension, while the new 7 have a social resonance and show worshippers that their vices affect others.
photo source: Sins from CaptainCollo