If by short you mean multiple weeks?
It is known they have a significant effect when consumed together with a weak stimulant, like caffeine or nicotine. Tobacco smoke is another significant source in the human diet.
It is known they have a significant effect when consumed together with a weak stimulant, like caffeine or nicotine. Tobacco smoke is another significant source in the human diet.
If it was weeks, they would accumulate to very toxic levels in anyone who smokes or has a few cups of coffee a day.
Your second point is spot on.