Nope. They don't. I don't, either. You shouldn't. But, yes; it's a funny funny! :)
I've never understood the appeal of the stuff (if I were a drug user, I would definitely be more of the cocaine type), but for those who do, have a happy 420!
I smoked it enough that I know (1) overdoses cause helluvalucinations, (2) You can't eat just one potato chip (bag) when you get the munchies, and (3) it certainly defines "chillaxation"!
Ah, then there are the chem's.
From the Mayo Clinic:
Marijuana contains at least 60 chemicals called cannabinoids. Researchers are evaluating how effective some of these cannabinoids might be in controlling symptoms of certain medical conditions. For example:
THC. An abbreviation for delta-9-tetrahydrocannabinol, THC is the main component responsible for marijuana’s mind-altering effect. It also may help treat signs and symptoms such as nausea and vomiting that are associated with a number of medical conditions.
Cannabinol and cannabidiol. These compounds have some of the properties of THC, but cause less psychoactive effects — the high.
The famous clinic went on to say, "Also, marijuana smoke contains 50 percent to 70 percent more carcinogenic hydrocarbons than does tobacco smoke and has the potential to cause cancer of the lungs and respiratory tract. Marijuana smoke is commonly inhaled deeper and held longer than is tobacco smoke, increasing the lungs’ exposure to carcinogens.”
Marijuana can have very different effects on people. The different -- virtually opposing -- actions of the two key chemicals in marijuana, THC and CBD (cannabidiol), may be the answer.