David West has undergone four surgeries in his long NBA career: left knee, right elbow and right foot twice to fix a couple of toes. ''I'm always struck every time I'm home on the couch watching a sporting event, some drug commercial comes on, they show these happy people jumping in a lake, rowing a boat, then you just wait for the qualifier,'' Warriors coach Steve Kerr said a day after revealing he tried marijuana for severe back pain. Kerr's players believe his voice can go far in starting a serious, thoughtful dialogue in professional sports regarding pot use for pain relief.