Pot today with it’s vastly higher THC levels is physiologically more damaging than alcohol.
As toxicologists say, the dose is the poison. But, a joint does more harm than a martini. Personally, my suggestion is to avoid both. But the neurological effects of high concentrations of current levels of THC in pot are severe. Obviously, if you are drinking a fifth of gin a day you will be worse off than if you have one joint a month. But, apples to apples, today’s concentrations of THC are worse. In fact, past studies are of limited value because of the lower concentrations of THC in pot. Colorado and other states will, unfortunately, demonstrate how destructive modern pot is. Having said that, I do not support the “War on Drugs”, nor do I think there is anything wrong with legitimate medical uses of pot (life is full of trade-offs).