Eric Buchanan envisions a day when marijuana will be as common as vodka tonics or microbrews at lounges and nightclubs across Washington. Until then, he and his business partners are weaving their way through largely untested and often ambiguous state laws in an effort to hurry things along. Their new Spokane Valley nightclub, The Lounge, is part medical marijuana dispensary and part members-only social club where patrons can smoke pot and mingle.