30 years ago yes, today there are plenty of druggies who were smoking pot years before they ever touched alcohol. The 21 year old drinking age along with endless public service announcements about how if you were 20 years old you'd die a horrible death if you drank a beer has created a generation who are convinced pot is safe, these morph into meth/fentanyl addicts.
One young woman I know was active in her school's MADD chapter when she was 16-17, walking around in white face paint (some kind of death mask) depicting people killed by drunk drivers and handing out pamphlets. She was a heavy pot user by that time though and reeked of the stuff, she'd never touched alcohol at that time so she was pure in her book. Today she's 28 and just had her first kid, she's about 300 lbs, tattooed everywhere, and couldn't wait to birth the kid so she could go back to her 18 hr a day pot habit. She's thrown in alcohol into the mix now along with God knows what else, I don't ask. The baby is less than six months old and she & her boyfriend sit around high/stoned most of the day. Great environment this child was born into. Pot's OK though, just ask her.
You are giving pot way too much credit. Pot doesn’t make people slobs, but some pot users are slobs.