the reality is that a lot of the people that voted for him don't know the difference between marijuana and heroin. drugs are drugs.
marijuana is, of course, more like alcohol than heroin - and according to most studies actually far less dangerous than alcohol. one of the reasons i support marijuana legalization is that it will hopefully reduce alcoholism, and all of the social and health problems associated with alcohol use.
but, you'll never get that across to the christian right - and that's who spicer is talking to, here.
http://www.latimes.com/politics/la-na-pol-trump-marijuana-20170223-story.html