I smoked weed every day for 10 years and basically forgot what dreaming was, people would tell me about their dreams and I thought they're nuts... I presumed I must be dreaming but I just didn't remember it, but the idea people could remember these extreme vivid crazy dreams they could control seemed totally foreign to me. I moved to a country where weed was very illegal and stopped smoking it, after about 5 months of no weed I started to have the most insane, crazy cool, very very vivid dreams. Then I moved back to Canada for a year and started to toke, again, I almost immediately stopped dreaming. When I left Canada again, and stopped weed again, dreams came back again. My personal very unscientific hypothesis is that I process a lot more of that emotional/thoughtful stuff when I'm awake and stoned, but honestly, who knows.. I find it somewhat concerning to be honest, the difference in my dreaming on and off weed is markedly very stark.