Soak wood chips in water for at least 30 minutes. Prepare charcoal fire in smoker; let burn 15 to 20 minutes. Place 1 cheese block on top of the other; coat with cooking spray. Place lengthwise in center of a 24 inch piece of cheesecloth. Tightly wrap cheesecloth around stacked cheese. Place wrapped cheese crosswise in center of another 24 inch piece cheesecloth; tightly wrap. Drain chips, and place on coals. Place water pan in smoker; add water to depth of fill line. Place wrapped cheese, seam side down, on upper food rack; cover with smoker lid. Cook cheese 2 hours.