. So this argument is pretty much saying that if we deem the lives lost as a result of drunk driving as acceptable, we should also accept the lives that will be lost by and to those driving under the influence of marijuana is acceptable.
Stirring the Pot: What the Pro-Marijuana Lobby Doesn’t Want You to Know
5 'n Dime
3019

This is a comparison which essentially equates the two substances and says if one is legal, them the other should be as well. This is reasonable and your counter-argument for this and the other points are a little unconvincing. It’s good to hear a different perspective however!