This man talks a lot of sense. I'd just like to back up his message by adding that I personally have managed to overcome several long-term addictions (coke, cannabis, tobacco, alcohol) over the past couple of years primarily thanks to routine exercise. I promise anyone that regular execrise will bring you more inner-happiness than any of the substances mentioned above ever could in the long run.
Correct. I also neglected to mention that it would most definitely also not be a good idea if you were very sick. The last thing your body needs at that time is another stressor. You should be relatively healthy when you start a detox.