My first thought, RubyRae, is that you might be in a different place, different time, different friend, etc. and there might be more going on with one friend and/or yourself than the other? I was also thinking about how "straightforward" trying to kill yourself is versus the gradual "loss of control" of addiction and accidental overdose. The first seems "neater" and almost more honest than "allowing" addiction.

Too, there is the thought that what we like/don't like is others is like a mirror and actually what we like/don't like in ourselves. Maybe you're upset/worried about yourself and possibilities for addiction or that "sort" of behavior.