I'm betting capsules or vaped cannabis would likely have a much more beneficial effect on GERD. It'd be interesting to try it as an experiment. For one thing, if its active ingredients do the good things for human insides that they do in small mouse studies, that'd be a great thing to experience first-hand. And I'm betting even do-it-yourself cannabis eating might have a positive outcome, too. Eaten cannabis contains fiber, which is good for GERD. The one hitch would be in avoiding eating cannabis in traditional fatty, sugary things like cookies or brownies or firecrackers. High-fat content foods and chocolate are known to be GERD aggravators. I suspect sugar can be, too, but that's just my guess.

This is all just my speculation, but everything I've read leads me to suspect that a non-smoked way of ingesting cannabis would probably be more likely than not to have a positive effect on GERD.