Cigarettes? We don't allow minors to legally have them, further they are taxed and regulated at great length. Also, there is a massive educational aspect warning everyone about the risks. Show me that with the American Football, please.
Manual Labor? Ever heard of OSHA, MSHA, NIOSH, NIST? Just a few of the agencies looking after the well being of folks working manual labor. I work in a glorified blue collar job, we are regulated very tightly. We have presumptive cancer laws and you can't perform our job as a minor... most don't make it until they are well into their 20's.