Not to be a naysayer, but when you get into legal terms, you have to be careful with terms like "addictive". Addictive implies a component of physicality (by the legal/medical definition, not the common definition). It's horribly habitual, which is as bad as, and hard to differentiate except in the physical symptomology of withdrawal.

I know this sounds like splitting hairs on message boards, but I can guarantee you that all of these people who have been called to testify have been briefed heavily by squads of lawyers.