By the way, why is this thread on "Spiritual" instead of "Off the mat?"
For the Rasta Aikidoists of course! Bob played here man!
Well sensei Barrish has expressed a pretty strong opinion against it, i believe because of its effects on attention and focus.
I've got some experience with it and I can't see any benefit, while I do see plenty of drawbacks, most notably the damage done to the lungs from smoking.