Like Solipsis already said, it's likely because the OP is a daily smoker. There is a group of people who love to smoke weed while on LSD, and a group who gets very bad experiences from it. I have seen no definitive proof, but it seems likely that the first group mostly contains daily smokers while the second group doesn't.
What always bothers me when reading about bad experiences with psychedelics is that people seem to overlook the link with weed. Very often the writer mentions smoking pot before things "go south". And most of the time they do not connect the smoking with the bad experience, while it is obviously the cause. The insight that smoking weed on psychedelics can lead to bad trips needs to be wider spread. It has caused a lot of good experiences to go bad and lead to potentially dangerous situations.