Actually I started a post on this a while back.
My wife, (a totally in JW sister) uses it as do several in our local congregation.
We are in California where it's been legal medically and now available recreation-ally.
We had a local needs talk on it a couple of years ago and basically it's up to your own conscience.
A brother wouldn't be eligible for extra privileges if he smokes it however.
We've even grown our own the past couple of years :-)