Reviews are usually double blind. Neither you nor your guest can see your reviews until you both submit.
Therefore you should leave an honest review without fear of retaliation.
Marijuana smell left in the room is very important to other hosts.
It shows bad judgment and disrespect.
More importantly with a quick turnover, marijuana smell is difficult to purge.
In your review keep it light and non judgemental.
"Room was left reeking of marijuana" or
"The marijuana smell left was diffiicult to clear for the next guests"
As for inflaming him to do you violence, most marijuana users are inured to criticism of their drug usage.
It will not shock him.
Good luck