Thought your post was spot on...except for the last line...
Considering that the main reason pot is moving toward legalization is driven by the tax revenue generated...
Our government has a very poor history regarding public health issues when tax dollars will be impacted...
Alcohol, cigarettes, cigars, chewing tobacco come to mind. All these products are legal and far more impacting health wise than pot...
If anything government will at some point increase the tax to drive pot use down but once these tax dollars are generated the politicians will never give them up...
How much tax revenue can be generated by people who have no incentive to work?
While marijuana's deleterious effects can be observed after fairly short-term, light use, alcohol and tobacco only cause health issues after years of heavy use. Meanwhile, people who drink and smoke are still able to work and produce, meaning that they remain profitable to the government for a long time. Marijuana users are far more likely to become a liability than to generate much in the way of taxes.