You’re right you should not smoke these plants but both do have medicinal uses.
Extracts of mistletoe have been used in cancer treatment.
Both Scopolamine and Atropine are derived from Nightshade.
In nearly all toxic plants medicinal components can be found.
In almost all poisons the dose is the critical factor.
Water is toxic in large enough doses.
Saying there is no medicinal value for any plant is foolish.
I never did claim that there are no plants with medicinal value...
There is a difference between using plants for bonafide purposes vs using them to alter your mind for a cheap thrill or high! One is medicinal the other is dangerous.
God gave us those plants, but not the wisdom as to how to use them. That’s up to us.