"Indeed. If it ain't broke, don't fix it."

I would take tDCS over smoking or drinking, any day of the week.

Or even extreme sports.

It's socially acceptable to do some activities which are known to be deadly, but god forbid trying the unknown! That's a total faux pas. What BS. Where's the cost/benefit analysis. Yes: drinking, smoking, and sports can yield utility (fun), but people increasing their IQ or any other vector of intelligence could have a profound impact on society.

I'm in agreement with the rest of your post.

Edit: changed italics from HTML to Markdown