There are many factors that could affect the future of the Cannabis Industry, but not limited to the followings:

The Government of Canada has provided guidance that, subject to Parliamentary approval and Royal Assent, the Government of Canada intends to provide regulated and restricted access to cannabis no later than July 2018, however there is no assurance that the legalization of cannabis by the Government of Canada will occur as anticipated or at all.

The legislative framework pertaining to the Canadian recreational cannabis market will be subject to significant provincial and territorial regulation, which may vary across provinces and territories and result in an asymmetric regulatory and market environment. Also, the impact of any new legislative framework for the regulation of the Canadian recreational cannabis market is uncertain.

Research in Canada, the U.S. and internationally regarding the medical benefits, viability, safety, efficacy, dosing and social acceptance of cannabis or isolated cannabinoids (such as CBD and THC) remains in early stages. There have been relatively few clinical trials on the benefits of cannabis or isolated cannabinoids (such as CBD and THC). Future research and clinical trials may prove such statements to be incorrect, or could raise concerns regarding, and perceptions relating to, cannabis.

The future of medical cannabis industry is highly dependent upon consumer perception regarding the medical benefits, safety, efficacy and quality of the cannabis distributed for medical purposes to such consumers. Consumer perception of cannabis products can be significantly influenced by scientific research or findings, regulatory investigations, litigation, political statements, media attention and other publicity (whether or not accurate or with merit) regarding the consumption of cannabis products for medical purposes.

References
Government of Canada - Legalizing and strictly regulating cannabis: the facts
MedReleaf Corp. Preliminary long form prospectus dated April 19, 2017
Grunewahl Organics Inc. Preliminary long form prospectus dated August 29, 2017