From swollen joints to dementia, seniors are increasingly looking to cannabis to treat the ailments of aging and a study is underway to better understand its effectiveness. Welcome to The National, the flagship nightly newscast of CBC News »»» Subscribe to The National to watch more videos here: www.youtube.com/user/CBCTheNational?sub_confirmation=1 Voice Your Opinion & Connect With Us Online: The National Updates on Facebook: www.facebook.com/thenational The National Updates on Twitter: twitter.com/CBCTheNational »»» »»» »»» »»» »»» The National is CBC Television's flagship news program. Airing six days a week, the show delivers news, feature documentaries and analysis from some of Canada's leading journalists.