You mean the stealing for money for high priced black market drugs?
You mean the shootouts/high speed chases where people run from the cops because they have a bag on them?
Or do you mean lighting up a joint?
The thing is, it's very easy to look at the statistics of violent crimes before and after. Also the vast majority of law enforcement agencies classify their crimes so you get detailed statistics of what kinds of crimes occur on a monthly/yearly basis.
Out of curiosity, what other businesses you had in mind?