The best thing to do is to leave the task to the professionals. Send the addict to a rehab center and support him/her emotionally as a friend or family so as they don't dwell back doing drugs. 

There are many rehab centers, which are doing it for non-profit, e.g., www.alldrugrehabcenters.com/ is a non-profit … Read more

No. But there were reports that they used to have some tiny amount of alcohol in the past. Nobody has proved it yet.

But don't worry, there a lot of sugar and caffeine mixed with carbonated water. An Indian Yoga guru has even described it as the perfect Toilet Cleaner.