In times past, the option of jail was meant to serve as a correctional facility for individuals who have erred. When it comes to crimes committed by people because of their state of addiction, jail was still the available option.
Recently, there has been a call for revolution, bashing the option of jail for addiction-related crimes and putting forward the option of rehab instead.
In the case of serving as a correctional facility of addiction-related crimes, a rehab serves a better purpose than jail time.
There would be an exception for this, if rehabs are incorporated into jail facilities. So that people who have committed certain crimes would serve their jail sentence within a rehab.

One of the amazing peculiarities of a rehab is the way it addresses addiction-related or mental health issues. It starts from the basics, addressing the individual as a while before delving into the full addiction inquiry.
A rehab would find out the reasons for your addiction and set measures in place to ensure your treatment and full recovery.
The jail system takes a rather different approach. They believe that serving jail terms would make the individual develop and maintain a cool-head. Hence, when the individual is out of jail, he or she would have overcome addiction.
This approach is not entirely effective because, some of them leave jail and resume their addiction-related lifestyle.
This time, they would be more careful not to end up in jail for addiction-related crimes. In another sense, some individuals in jail still continue their addiction lifestyle when they have access to some of these substances.
So, while in jail, they will continue in their addiction and when they are out, they sustain the continuum.
Addicts fare better in a rehab because there are individuals who are willing to care for them.
There are mental health counselors and therapists who are interested in ensuring that addicted individuals are restored to normalcy.