A friend of mine sent me this pic to identify the chap who's with with Paul and Linda McCartney. Of course, it's Dave Gilmore of Pink Floyd. They all seem to be happily smoking away on something and I bet it's a bit stronger than tobacco.
It's funny how a little weed can help them create silly little albums like "Band on the Run" and "Dark Side of the Moon" about the time of this photo which is circa 1973.
Later on, Gilmore played and sang with Paul on his "Run Devil Run" album and concerts in 1999, soon after Linda's death.