and I respect you immensely for that!
We all do it. Every one of us on some topic or other. Being able to recognize and change it is what matters.
There's no reason you "should" smoke pot. It's not necessary or vital, but...my sole argument is that it is ethically wrong to jail people for doing so. Even for using other, admittedly harder drugs.
I honestly don't know if there's any proof that smoke itself is carcinogenic. Maybe, but...we inhale carcinogens all day every day. Exhaust from cars, industrial waste, etc. Inhaling smoke is not "good" for us, but again...that does not justify making something illegal or jailing people. The State is not our protector. Our choices are our protector.
I'm not a huge fan of busting people for DUI, either. DUI in and of itself is not a crime. DUI busts are nothing but revenue for the State, but I can see your point, and if we were to legalize pot I'm sure most people would be fine with moderate regulation regarding places of use, etc.