It will take more than six months for the addiction and gateway to other drugs affect to surface. By then it will be too late. However, there are deaths directly because of the dope and the increase in DUI from dope smoking dopes.
"Never" is more than six months, true. Marijuana is less addictive than alcohol or tobacco - and there is no 'gateway effect,' just an underlying propensity to alter one's mental state and/or engage in forbidden behaviors.
By then it will be too late. However, there are deaths directly because of the dope and the increase in DUI from dope smoking dopes.
So should we re-ban alcohol, the "I" in the overwhelming majority of DUIs?
It's like anything else, for example the use of mind-bending legal meds or the abundance of required vaccines. Long term studies of something require a few generations. All of these studies draw long-term conclusions from short-term results.
Anything that messes up reproduction will never go away.