Nothing happens in a vacuum. No man is an island. Every decision everyone makes affects someone else in some way or another. You're wanting to make smoking dope legal makes it more difficult to teach my children and grandchildren that drugs are harmful and destructive. You're wanting to make pot legal means that pot is going to be more available to the detriment of our culture. It's not a matter of personal freedom. It's a matter of personal responsibility and consideration to others around you. It's about selfishness versus sacrifice.
Have trouble telling your kids that about cigarettes or alcohol? My parents didn’t have any trouble doing so with me.
Frankly, there won’t be much difference in the availability of marijuana if it is legal compared to now. And in Amsterdam where pot is legal, use is lower than it is in the US where it is illegal.