You're not engaging with my point.

I basically said that "Yes, marijuana can have harmful effects" and here you are saying "See, it's harmful!" I don't disagree with you. It's about how we mitigate the harms of substances on society - especially as it relates to children. 

Your inconsistency is how you think that a total prohibition of marijuana will SOLVE these problems. The argument is not wether if or if not marijuana can be harmful - we agree. You keep changing the topic, and trying to argue from a point you know I agree with you on.

The entire point I am disagreeing with you on prohibition. I am using guns as an example of something else that can have harmful effects that you don't think the solution to is prohibition. Why? You have yet to justify your inconsistency. All you've said is "guns save lives" which isn't an argument and surely not true in the majority of cases. Guns cause a lot of harm with or without the influence of narcotics. Why is one okay and not the other?