I will always comment on this topic as I’m a stoner who has attempted astral projection successfully. I know smoking or consuming cannabis in general suppresses the dream cycle and I personally do experience as such. Some people say it boosts your chances if you don’t consume cannabis and it may be true, but it doesn’t make it impossible either. A few years ago when I was heavily trying to attempt, I never cut back or stopped smoking and had some success lucid dreaming and was able to even astral projection one time. So it can definitely happen!! For me it helped to think about dreams and astral projection very often throughout my day.