Drug addiction is an illness, but it's not like you randomly get the drug-addiction-virus because you didn't wash your hands after touching something in the sup

Drug addiction is an illness, but it's not like you randomly get the drug-addiction-virus because you didn't wash your hands after touching something in the super market. Drug addiction usually follows drug abuse, and drug abuse often has a reason. That reason is what leads to drug addiction, in other words: drug addiction is a symptom. You can get people into rehab, but unless the reason for their drug abuse is fixed, they'll have a hard time getting & staying clean. If someone limps because their leg is broken, you'll try to fix their leg, not teach them to walk differently so the limp isn't as visible.