A reader writes:

I'm a more-or-less daily smoker. I smoke to help with problems associated with being a survivor of sexual abuse. I don't remember much about my abuse, thankfully, which happened before I was 6.  But the lingering effects are anxiety and nightmares.  When I stop smoking, I rarely sleep a full night, as I'm plagued by nightmares of the demons of my unconscious mind: squids attacking me in the ocean, or bats from a dark sky, etc. With a little THC in my system, I never have these dreams; without THC, I'm attacked every night. Thank God for it.