Actually, shrooms are pretty much like marijuana (when it comes to death/health problems and such), except the difference in trips.
I also don't believe that marijuana causes people to do harder drugs, rather the people around them. I know plenty of people who have tried drugs just because their friends do them. Another good example is when, say a teen, who does marijuana, encounters with a dealer who encourages him to do something harder. "Hey, try some ecstasy, it's better then weed" or something along those lines. Which actually would be avoided with the legality of marijuana, because weed would only be available in coffee shops/dispanseries.
Shrooms give you food poisoning along with other detrimental side effects, pot doesn't. They are not even remotely the same.