With tax revenue from legal pot sales in California falling short of projections, a financial analysis firm estimated Tuesday that total sales this year will be $1.9 billion, significantly less than the $3.8 billion the company expected.The firm, New Frontier Data, had also estimated that total sales in California would reach $6.7 billion by 2025, but now says it is more likely the industry will generate $4.72 billion by then.Most cities in California have refused to allow pot businesses, and there are tough rules for those who want state licenses to grow, distribute and sell marijuana.