My best friend is going downhill
my best friend smokes pot nearly every single day and i tried to subtly bring up that shes doing it too much and i feel like she got a little bit mad, and even her sister messages me and shes upset because her sister isnt the same anymore. all she does is get high and shes left her ambitions and goals behind which sucks. she was driven and had self control but now its all gone. we dont talk that much anymore its killing me.
how would i approach this? no one else will say anything to her.