The thing about that is you can phrase nearly anything in terms of freedom. Illegal cannabis = freedom to live in a place where your children aren't exposed to drugs. I don't agree, but for me the notion of freedom isn't very helpful.
For better or worse illegal cannabis doesn't mean your kid won't be exposed. It means that when your kid is exposed and perhaps tries it, He/she has a good chance of developing a criminal record, going to jail, dropping out of high school, etc. All consequences that are much worse than the drug itself. If you even believe that it is detrimental to smoke cannabis.
It would be more accurate and productive to characterize such a view as "freedom is one of many things to value".
"My kids not using weed" is another thing to value (and not unreasonably), orthogonal to freedom. It's fine to characterize that as something to value, but not as a variant of freedom.
"Satisfying intimacy with my S/O" is also something to value, but also not a species of freedom, and likewise unhelpful to frame as "freedoms from lack of intimacy".
Others' actions can limit your freedom. When I am forced to do something, I am made less free. Being forced to inhale secondhand cigarette smoke is an example.
>Freedom is the right to act, not immunity from the effects of others' actions.
What about the freedom to keep slaves? The slaves are "free" to run away, they're just not "immune" from the actions of the slave keeper if they get caught.
This is why the term freedom is almost useless. People inevitably mean "the set of freedoms I care about", which will always come at the expense of other freedoms.
It has been illegal for so long now, and kids are still exposed to it, now even more than ever. I have no idea how people still think that prohibition makes drugs go away.
That might make sense for things like "Freedom to a smoke free school", which should be just as true for cannabis as tobacco, but when somebody can't use cannabis in their own home it's hard to frame it like this.