Haha... I don't think anyone implied that, exactly. ...But it's like you joined a gun club and on your first day skipped safety class to run straight for fully automatic machine gun section.
What they're saying is that maybe (big fucking MAYBE) with no debt and a solid index portfolio (possibly diversified) already under the belt, well on your way to FIRE, then perhaps you can toss around a grand or two of fun money. Never anything more than 5% of your portfolio (tops!).
For the record, I think some of the weed companies might do well (if their accountants aren't stoned) but if it does become legal they'll rocket in worth followed by the biggest plummet as Shoppers, Rexall, Jean Coutu, and Walmart all stomp the little guy. You don't hear much about the billionaire Canadian apple, potato, and cucumber barons do you? No. Weed's a crop, just like any other. If legalized, you'd theoretically be just as well off investing in basil or oregano.