I think the argument is that it alters your mind in such a way that your control over yourself is greatly reduced. Your thinking becomes slow and muddles, your inhibitions slacken, your self-control disappears.
I'm a daily marijuana smoker and I have to disagree with this generalization. Marijuana involves an astounding number of chemicals and cannabinoids, many of which contribute to the active 'high'. Every strain of marijuana is slightly different, and contains varying levels of these compounds. This is why pot smokers are so keen on varying strains: One strain can put you to sleep and another can make it
impossible to sleep because your thoughts are racing so quickly. One strain can cause anxiety, while another can actually
decrease anxiety. For this reason, I believe it's incorrect to state that one's thinking becomes slow, and their inhibitions slacken. It largely depends on the individual and the strain involved.
Interestingly, one of the most beneficial compounds in cannabis, if not the
most beneficial, is cannabidiol (CBD). I say this is interesting because CBD not only doesn't get you high, it will
actively reduce the effects of THC, meaning that balanced levels of CBD and THC will leave a person feeling less altered mentally, but completely medicated physically. It's astounding to me that the federal government would block research into compounds like CBD, when CBD isn't even the chemical recreational users aim for (Almost all modern cannabis strains have a very high THC level, with very little CBD).
If cannabis were legal, I would probably have four different strains (I suffer from bipolar II disorder, as well as severe anxiety)
One for anxiety. (Lower THC, above-average CBD, and CBN)
One for depression/suicidal idealization. (High THC, low CBD)
One for pain relief/general health (High CBD-to-THC ratio)
One for sleep. (High levels of CBN and THC)
Before long I'm sure we'll have legalized medical cannabis sprays that are literally taken from plants grown by pharmaceuticals. They already exist in several other countries. Of course, anyone who wants to grow their own cannabis for 1/20th the price of pharmaceutical will be locked away as an evil druglord.
Sorry, I know I got rather off-topic here, I just thought it might interest some of you to know a bit more about the variances. And yes, I don't think anyone can argue that, had any drug-user stuck with marijuana, they wouldn't have died from drug-related causes. Personally, I've never had the desire to try anything stronger than cannabis. It gets me where I need to be, and I can use it knowing that I will suffer very little in terms of bodily/mental damage. The same cannot be said of the "gold standard" bipolar medication, Lithium. Lithium is safe in the right doses, but at higher levels becomes toxic to the kidneys. Personally, I just can't stand the idea of taking a pill that, if I accidentally take more than the appropriate dosage, or if I allow myself to become dehydrated, can have fatal side effects. No thanks. I'd rather vaporize a relatively harmless flower.