One must be cautious to avoid the
"Post Hoc, Ergo Propter Hoc" fallacy.
Furthermore, take care to notice "newsworthiness bias", which is when disproportionate media interest in an issue makes it seem more prevalent. Also, "if it bleeds, it leads" has been a journalistic aphorism for a long time. Watch out for articles in the next few months about injuries caused by "Pokemon Go" specifically, rather than something more generic and mundane, like "mobile phone games".
As some organizations with political clout have vested interest in continued prohibition and some influence of mainstream media, my opinion is that there is a slight bias in favor of running news stories that tend to portray marijuana use in a negative light. Of course, there has always been significant bias in the counterculture in favor of portraying marijuana as harmless or benign.
For a benchmark, acetaminophen causes roughly 450 deaths/year (in the US) from acute liver failure, as a verifiable medical statistic. The CDC believes about 88000 deaths/year (in the US) can be attributed to ethanol, from all proximate causes. Perhaps 480000 deaths/year (in the US) may be attributed to smoked tobacco.
Clearly, society has some tolerance for fatalities from legal drug use.