Many drugs can trigger underlying mental disorders like schizophrenia, depression, and some others, so even someone who has healthy mental health can develop symptoms of some of these disorders after only doing the drug once
That's another reason to never even try them once because they could give you some serious problems even if you take them with consideration and aren't addicted
Many drugs, yes, however marijuana simply does not have the potency to do any of those things, and, quite on the contrary, has the effect of treating depression, anxiety, schizophrenia, and other serious mental illnesses. Now, I know marijuana cannot cure these things on the long term, and as oppositionists would say, "It's only a short term fix for a long term problem", but when you think about it, what
is a long term fix for these things?
Antidepressants have to be taken repeatedly every single day for them to work effectively, and they wear off after several hours, just like marijuana. Schizophrenia is nigh incurable, but it is treatable, and once again, daily doses of pharmaceutical medication are needed.
Additionally, it is pretty much impossible to develop a dependency on marijuana just from the first use, especially as many people do not even report feeling high the first time they smoke it. It is also extremely difficult to develop a dependency on marijuana on the second, third, fifteenth, thirtieth, or even hundredth time. To develop a dependency you, first of all usually need to have a pretty shitty life. Potheads generally have something in their lives to escape from, and use marijuana as a device for happiness. These people smoke every single day, and are high basically all the time, and someone of these people who I've talked to told me they have trouble remembering when they were last completely sober for an entire day. This kind of dependency, while looking horrid on paper, is actually still not life destroying. These people that I met were some of the nicest people I'd ever encountered in my life, they had a far better work ethic and GPA then I did at the time, and they were also extremely intelligent. At this point I was still uneducated about marijuana and I could not figure out for the life of me how these people, these stoner scumbags, had their lives together better than I did. I tried every chance I could to think of excuses, to look down upon them.
At least I wasn't destroying my mind,
At least I wasn't a stupid hippie (which they weren't, actually, I just lumped all people who smoked weed at the time in with hippie no-lifers).
Eventually, as I grew older, I began to think about things a little harder, and I began to hear things about the medical benefits of marijuana in small doses, the lack of conclusive scientific evidence supporting many of the claims made against marijuana, and, most of all, and perhaps the least rational, the wonderful immediate effects of the drug itself.
I sort of deviated away from what I was trying to say here, but basically, most of the claims made against marijuana only come into validity when referring to extremely heavy users, and even then, the effects are nowhere near as bad as they appear on paper. Additionally, the "high" effects that marijuana has are not nearly as intense and serious as people would like to believe, and it's entirely possible to function normally while high. Marijuana does not impair speech, movement, or cognitive function, and you can still think clearly while high, depedending on just how high you are.
Oh, that's another thing. Your intake of marijuana is entirely controllable. I'm not sure why people think there are just two planes - completely sober and super high. Take a few hits from a joint? You're probably either not effected very much at all or moderately buzzed, depending on how good the weed is. Smoke a whole joint? You're probably at a mid-level high, again, more or less possibly, depending on how good it is. Two joints? Pretty high. The ascent is pretty gradual, and you can control it each step of the way. It's not like once you take a single hit you're like "OH MY GOD THIS IS AMAZING", and then you take forty thousand more hits and wake up in the hospital the next day.
Another thing I wanted to say earlier is that marijuana does not need to be smoked. There are countless possibilities for edibility, like baking it into brownies, cookies, and pancakes, and you can also use a vaporizer, which superheats the marijuana in a chamber, and then converts it into water vapor instead of smoke. This eliminates any health concerns that could come out of normal smoking, doesn't smell at all, and is also very economical, as it conserves the herb a great deal, because it is not combusting.