Just to be clear...
I've smoked a lot of weed in my time, I used to be a very regular smoker as did almost all my friends... during the entire period I was smoking weed I had a succession of jobs that improved as time went on, neither me or any of my friends ever committed any crimes to fund our smoking, which is the norm for the majority of people that smoke.
Sure, you are always going to get a few people that will turn to crime to fund the smoking, but that's not the fault of the smoking, that's the fault of the person.... the same people are the ones that would steal to buy a pint, or to get the latest phone if they wanted it.
People who refer to smokers as junkies tend to be the ones who have never had any real life experience of what they are commenting on and are basing their opinions solely on negative media hype over the years (the daily mail said it true, so it must be true type of person)