with pot if yah grow your own its no more harmful to the environment than any other crop....
with heroin i can grow opium poppies in my front yard, cook up heroin in my kitchen and harm no one, same with cocaine....
cooking meth not only [bleep] up your place it can very well [bleep] up your neighbors.....
Wtf? There are laws against the manufacture of dangerous substances already besides just the liability after something happens. So there is a three pronged attack against your argument here. One being that if it is legal it will be cheaper and/or easier to obtain and the meth heads won't bother cooking it. Two, the financial liability to endangering your community and three the legal liability for doing so.
You can't readily manufacture cocaine and heroin out of raw materials here in the states or it would already be being done just like Meth and Pot.
