From The Guardian:
The distractions of constant emails, text and phone messages are a greater threat to IQ and concentration than taking cannabis, according to a survey of befuddled volunteers.
Doziness, lethargy and an increasing inability to focus reached “startling” levels in the trials by 1,100 people, who also demonstrated that emails in particular have an addictive, drug-like grip.
(See also this article in The Register.)
Sadly, this line of argument works on the assumption that US drug law has any shred of rational basis in the first place.
Well, granted. Plus, I really don’t want to think about sharing anything like that with most legislators.