Fully 49% of electronic and appliance shoppers use smartphones in-store, and 8.3% of sales in those stores are influenced by smartphones,according to new research from Deloitte. Electronics and appliance stores see the highest smartphone use and frequency among 11 types of retail stores (including department stores, apparel, grocery stores, etc.), where smartphone use influences 5.1% of sales on average. This influence translates into $159 billion in forecasted sales for 2012. That influence will rise as high as 20.6% in 2016, to reach $689 billion. Read the rest at MarketingCharts.