Rihanna, the warbler behind the hit single "Umbrella," was photographed on vacation in Hawaii yesterday smoking a cigarette that looked suspiciously like a blunt. then, as if to preempt any questions about what it was that she was smoking, she followed up last night on Twitter expounding her love for "kush" and a "glass full." She prefers "the better things" in life, she tweeted. Reached for comment, her flacks had no comment.