How about Heroin dealers? Or latterly Crack dealers? Met any of those?
You won't get people 'pushing' Coke or Weed, as they're not particularly habit forming and they have a relatively positive and desirable image, amongst certain parts of society.
Heroin / Crack are extremely habit forming and are 'escape' drugs - people often won't want to start using, but will accept an offer of a hit to make the pain go away. Once they have become addicted, they'll do anything to get another one - this is where the mugging / burglary / prostitution kicks in, not with Weed or Coke.