Physician: Hatha yoga is a powerful tool for helping people quit smoking.
Conclusion
Hatha yoga is a powerful tool for helping people quit smoking.
Evidence
In a trial, people who practiced hatha yoga and got individual counseling reduced smoking and cravings as much as did people who went to traditional self-help groups and got individual counseling.
Evaluate
Given that yoga + counseling = self-help + counseling (in terms of reducing smoking / craving)
How could we argue that Hatha yoga is not a powerful tool ?
Well, first of all we need to watch out for the vagueness of "reduced smoking and cravings as much as X".
I can say . That doesn't mean that either action actually engendered good will. (They might be tied for engendering ZERO good will)
Similarly, maybe self-help + counseling doesn't reduce smoking and cravings much at all. In that case, if hatha yoga + counseling reduces a comparable level, then hatha + counseling also don't reduce smoking and cravings much at all. Thus, it would be hard to call hatha yoga a powerful tool.
Finally, maybe self-help + counseling does powerfully reduce smoking and cravings, but it's all because of the counseling. Thus, hatha + counseling would also powerfully reduce smoking and cravings, but not because hatha yoga is a powerful tool, rather because counseling has that effect on its own.
Goal
Look for an answer saying or an answer saying .