Why didn't meditation help Chögyam Trungpa Rinpoche or Alan Watts?

I struggle with an addiction and try using meditation to help me but... I frequently see quotes and videos pop up from teachers such as Rinpoche, Watts and Yeshe and I have to ask myself why didn't meditation help with their addictions?

So whenever I am confronted with their stories it reminds me that it didn't seem to help them and that deflates my own attempts at tackling the addiction with meditation.

Are there any ideas as to why it seemingly didn't help them in their struggle with addictions?