Heard this at my place of employment yesterday. One of the Mexicans made a serious comment to our foreman that dope makes you stronger. As he explained further, down there very few businesses can afford to own forklifts, so its common for business owners to hire a couple of teams of guys who just do all the heavy loading/unloading of trucks and such.
Apparantly, these teams smoke weed all day long believing it to give them the power and strength to handle the job. The guy telling us this was insistant that it didn't make a difference to the person's size, as average-sized people could and commonly were on these teams, as long as they were high they could lift as much as anyone. While I believe him, I find the real irony here that the people of a country that allows anabolics to flow like wine use weed of all things to empower their labor for heavy manual lifting.
On a side note, this guy also used to work for a pharmacuetical company down there, and shared a story of one of the workers failing to use gloves while transporting buckets of female hormones and getting a serious case of gyno after a few short weeks as a result.