I'm a born-again Christian but I think that argument is bunk. The Founding Fathers and early Americans were not a bunch of pot smoking sex fiends. When teenage girls didn't get welfare checks for having sex they had to remain chaste until marriage. When getting a divorce meant establishing fault men didn't leave their wives for younger, prettier women. When the Government didn't provide poverty programs for the poor you had to learn a trade or get an education. The private charities that filled those needs before Big Government pushed them aside used to provide moral and Christian counseling along with financial assistance. Let's shrink the government NOW.
A followup point - economists have a phrase to describe the above. It is called 'moral hazard'. It was originally discovered because insurance agencies noticed that people engaged in more risky behavior after getting insured. Insurance companies tailor the rates they charge to risk categories, but the federal government's wealth redistribution policies result in the opposite effect: lower rates for those who engage in the riskiest behaviors, and higher rates for those who are most responsible.
I dont know if they actually smoked it or not. Jefferson raised marijuanna/hemp, and George Washington took opium/laudenum. But anyways, the founding fathers did NOT make marijuanna illegal. The founding fathers did not pass a law against the possesion of any inanimate object. It wasnt until very recently in 1939 that we had our first law against marijuanna, long after the founding fathers died. Even opium and heroin were not outlawed until the 20th century, so a lot of presidents never gave making pot illegal any thought at all.