I think you would agree that a pot user is more likely to try harder drugs that one who eats carrots or drinks milk, yes?
That, in THAT sense, pot makes you more likely to want to try harder drugs?
Some people have a predisposition to want to use psycoactive drugs. Carrots and milk aren't, so I don't buy and have never made that argument.
That, in THAT sense, pot makes you more likely to want to try harder drugs?
Why would it? If someone tried pot looking for whatever it was they were after, and then went on to other drugs, then the pot wasn't what they were looking for.