Rica Madrid poses for a photograph as she smokes marijuana in her home on the first day of legal possession of marijuana for recreational purposes, Feb. 26, 2015, in Washington. (Alex Brandon/Associated Press)

Matthew L. Springer’s Feb. 4 letter, “Secondhand marijuana smoke is harmful, just like tobacco smoke,” comparing cannabis (marijuana) smoke to cigarette smoke, is laughable. While cigarette smoke is enough to gag a maggot and cause emphysema, cannabis is nothing like it.

In 5,000 years of documented use, cannabis has not killed a single person, while cigarettes kill more than 1,000 Americans daily. Cannabis smoke may be unpleasant, but it won’t kill anyone.

Stan White, Dillon, Colo.