actually, sorry.
a gram of marijuana is normally priced at a maximum of $20.
a gram of meth is usually $100.
a gram of heroin is usually up to $300.

but yeah, it takes a lot less of both other substances to get you high than it does marijuana. but seriously, the best argument here is marijuana vs. tobacco.
you can get 3/4 of an ounce of pipe tobacco, good tasting stuff, with all the nicotine you need, for $5.99.
don't start with your pot prices.