Wow, how effective can the rehab be? Just wait until they overdoes and go to the hospital, that should shake them up enough to stop.
Or, your friend could be too weak to stop doing drugs, and they will live a pitiful life that consists of one high to the next.
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1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, 8192, 16384,
32768, 65536, 131072, 262144, 524288, 1048576, 2097152, 4194304, 8388608,
16777216, 33554432, 67108864, 134217728, 268435456, 536870912, 1073741824,
2147483648, 4294967296