The essay's horribly written. Not trying to be offensive, but you really should get a good writer to revise it for you next time.

Also, as much as you say marijuana isn't a gateway drug, I know plenty of people who started with marijuana and moved on to other drugs. I'm all for legalizing it due to the added tax revenue, but I think you've naive if you think smoking marijuana won't make you more likely to try other drugs. Which is not to say all people who smoke marijuana will try other drugs, but it makes it more likely as you've already become more comfortable with illicit drug usage and will be less inhibited to go on to chase that dragon elsewhere .