Is my method of Marijuana smoking safe for my voice?

[SlimJim1]

So I am a pretty serious vocalist, specifically opera, but I also suffer from anxiety, depression and general inability to relax. I expressed an interest in Marijuana and it's benefits to my psychologist and he agreed it would be a good idea for me to try. I've researched all the harms typical smoking does to the vocal folds, most notably the heat of the smoke, dehydration and irritants, however there is a lot of evidence to suggest that using a water pipe/bong as a means of filtration greatly reduces the irritants as well as using ice or cold, clean water in the bong and drinking plenty of water after each pull. I know the obvious alternative would be edibles, but I've had them on a few occasions and they've had little to no effect, apparently due to my high metabolism. I'm also concerned with the length of edibles, as I'm a busy, working man. Would my process be safe? I also only intend to do it maybe once a week or every two weeks.