Trust me, I understand the impact of drugs on people and a society. I have know people who used drugs and ended up killing themselves and I was born in Colombia. As a child, I was driven to school by an armed guard.
However, it is the weak among us who allow themselves to succumb to addiction and the government has no place protecting weak from themselves.
In your case think of what intervention saves you. You pay taxes, whether you feel taxes are justified or not. It's cheaper for society (the people who choose, support, and provide mandates to members of the government) to help most people get back on their feet -- fewer criminals victimizing us (getting money for drugs), prisons less populated (saves taxpayer money), fewer disfunctional parents (can take care of their own kids if they are rehabilitated). Less costs to society, less cost to you, since you pay taxes.