You do realise that tobacco kills 41,000 people per year from second hand smoke, right? Read that again till it sinks in. So no, it's not just a case of "they hurt themselves". A single smoker can affect the lives of dozens of people in their vicinity.
Ban alcohol, organised crime increases. Don't repeat the same mistakes of prohibition
DMAA isn't in the same league as alcohol and tobacco, and the main concerns are more than it isn't yet considered compliant under DSHEA. It currently would need an NDI filed for compliance.
Debatable? Sure. But that is the Govts. current position. Hi Tech tried to fight this of course, and kudos, but that is whyyou can't really compare DMAA to either smoking or Alcohol.