In a congregation I was in some 15 years ago a brother was prescribed medical marijuana for his spinal pain relief. He let the elders know just in case anyone in the cong reported him. I was with him when he told the elders. One elder replied that he did not think it was appropriate for Christians. An answer had already been prepared. The brother replied "well if that's the case then I want to report every sister in the congregation for fornication with their gynaecologist." The elder got the point. Another elder smiled and replied "as long as you don't light up in the kingdom hall carpark."
On a side note: The blood prohibition is in the bible alongside the fornication prohibition. The Watchtower defines fornication as including digital penetration, yet the governing body allows a gynaecologist to perform such an act on a woman with no repercussions because it is a medical procedure. Well, so is a blood transfusion.
