Addiction is a process, very few people go from using no drugs to using heroin and getting addicted to it. It starts from alcohol or a cigarette, then as you get used, you desire stronger ones which leads you to heroin or coke and slowly by slowly you cannot live without them. You wake up wanting heroin and rest after heroine. You become an addict.
At this point, your loved ones may intervene and recommend you for rehab or even check you in one. But the truth is if you are not willing to get rid of your addiction, you may never see the essence of rehab. Below is why rehab is necessary.