When investing in dividend stocks, opting for high yields can be a seductive strategy. However, a high yield means little if a company cannot sustain it and is, eventually, forced to slash its payouts. That's why income-seeking investors should focus first and foremost on a corporation's underlying business.That brings us to Innovative Industrial Properties (IIPR -2.60%), a real estate investment trust (REIT) focused on the medical cannabis sector. The company's forward yield of about 11% looks attractive, ...