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If you truly think that "having babies" and "smoking weed" can be compared in any meaningful sense like this, I'm not sure what to tell you.

I truly think "it's not a very strong argument". If only I had said those exact words in order to communicate clearly.

babies -> needed for civilization to continue

weed -> possibly negative effect on civilization ( https://pmc.ncbi.nlm.nih.gov/articles/PMC2424288/) , certainly not a requirement.

Are you ok with ciggarete smoke then if you are ok with marijuana smoke?