The margin of exposure, a ratio that calculates the likelihood of lethal drug overdose, for daily drug use. (Dirk Lachenmeier and Jürgen Rehm. Scientific Reports, 5: 8126 | DOI: 10.1038/srep08126. Creative Commons.)
There are at least 10 drugs that are more deadly than marijuana, including some that are legal, such as alcohol and nicotine, a new study by researchers in Germany and Canada finds.