: Investors are currently focused on its experimental epilepsy drug, Epidiolex.

: The first cannabis company to go public in North America.

The cannabis sector in 2015 is a "growth-driven marketplace full of opportunity" as more U.S. states like Oregon and Alaska implement legal programs and others move forward with medical marijuana initiatives. While the market is volatile, several key players are emerging as viable investment plays, particularly those focused on medical research and early-stage infrastructure. Top Cannabis Stocks to Watch in 2015

: Widely considered one of the most stable and viable plays in the marijuana space. Insys Therapeutics (INSY) Focus : Pharmaceutical research and development.

: Establishing itself as a market leader with significant production scale. Aurora Cannabis (ACB) Focus : Medical marijuana cultivation.

: Entering the market at a critical time as a major Canadian producer. Industry Outlook and Risk Factors

: A leader in cannabinoid-based prescription medicines.