Oh yeah,I smoke leaf all the time and have for 40 plus years. I don't know how many people I've unknowingly got ripped on leaf from the upper third of male plants over the years then revealed what they'd been smoking after they were raving about how high they were. Some of 'em will claim they're really not that high then,but those narrow red red eyes and couchlock they're suffering from tell a different story.
Just about every serious outdoor grower I've ever known smokes leaf now and then from mid-summer until the buds come in. A lot of folks grow a small leaf patch that they cut about the middle of July to hold them over until harvest. My leaf is 2-6 hits and quit at the end of the season,depending on what part of the plant it's from. Bud leaf goes about a hit and half and smacks you like a board to the back of the head.
Leaf is well worth smoking,anyone who tells you different is full of shit. The high is little shorter,about an hour and a half,but midsummer when it's fresh picked on a bright hot day,it will give you one of the trippier pure THC highs you'll ever come across.
Maybe you Euro-growers don't have intense enough sunlight for leaf to produce decent levels of THC?
The idea that leaf won't get you high is a myth that's popped up over the past 20-25 years. Anyone who was smoking before,say 1985,knows damned well leaf can get you ripped. I can't believe the ignorance that gets spread as gospel about weed these days.