I've read that LSD accumulates in your spinal fluid and for the rest of your life can cause unexpected flashback episodes. I've read that after five hits of acid, you're actually legally insane. I've read that some teenagers on mushrooms thought a midget/kid with down syndrome was a gnome and kidnapped her and put her in a closet and didn't discover their mistake until the next morning. I've read that every time you take LSD there is a risk of causing permanent psychosis/schizophrenia. I've read that sometimes people on acid think they can fly and jump off buildings and die. I've read that MDMA causes brain lesions and makes your brain look like swiss cheese. I've read that marijuana starves the brain of oxygen and kills brain cells.
I've also read that all of the above are urban legends, misinformation spread by anti-drug campaigns, and discredited scientific studies. I've read that psychedelics only trigger psychosis in people who are already at risk of psychosis. I've read that overall, they have a positive effect on mental health. I've read that they are very effective at helping people overcome addictions, depression, PTSD, interpersonal problems, and even depression related to terminal illness.
Sex gives you oxytocin, the runner's high works on the endocannabinoid system, and even these activities come with risks to your health if you do them irresponsibly.
Alcohol is a hard drug, and arguably a lot more dangerous than many illegal drugs.
It would be silly to base your perception of alcohol entirely on prohibition-era anti-drinking propaganda, frat boy culture, and stereotypes of drunken wastrels. Likewise, it is silly to base your perception of soft drugs on prohibition-era propaganda and stoner culture.
Also, regarding the loss of motivation from pot--that's a result of excessive use. Around here (Canada) moderate cannabis use is almost as commonplace as drinking, and the stereotypical unmotivated potheads are few and far between.
I'm just a little boy.