My personal reply, not the OP's...
"If you have any liberty blood flowing through your veins, then why would you even care what others do, if it doesn't affect your personal life?"
Liberty does not equate to indifference! Neither does love!
Also, what others do constantly affects my personal life. The reverse is also true, the words that I've written here are affecting you, as the words you have written have affected me. Libertarianism does not equate to solipsism.
"Are you so pained by a pot smokers infringement on your own personal existence?"
Not once did the OP claim that pot smokers infringed on his/her personal existence. Nor did he/she claim that he/she was pained.
"your argument opposes thoughts/actions that you personally oppose"
Please review your quote. Is this worded correctly to express your actually intended sentiment? It confuses me.
"and it is a failed argument."
Is that claim an attempted resolve from the previous phrase, or does it stand alone as merely unelaborated sentiment?
"Even Ron Paul supports this position"
What do you mean by "this" position? If "this" refers to the OP's argument, I might agree. If by "this" you mean your position of "it is a failed argument", I would consider that to be far beyond wild speculation [yet unbelievable]. Although I don't assume it definitive, but from all the information I've gathered from Ron Paul over the years, I'm inclined to think RP would generally agree with the OP's basic moral argument, not that it really matters politically.
Ron Paul's concept of libertarianism is politically radical, but it is perhaps not as morally radical as you may think. I find him morally aligned with this...