People can take drugs and not look inadequate (due to the fact that you do not see them at the time of use or due to a personal reaction to certain drugs). It may seem that they lead a completely normal life, but this does not mean that they do not harm their health. Drug use affects the general well-being, and sometimes on specific internal organs (such as the liver or the digestive tract, for example) and the psyche.
Ie. if something does not interfere with your life and, for example, even work, this does not mean that it is harmless for you.
The myths that drugs supposedly help to create seem to me an insult to the creators - as if their abilities not enough for that. In addition, creativity requires not only talent, but also discipline, and this is not particularly good for drug addicts. And if he creates, it is more likely not because of the drug, but in spite of it.
I think it also depends on the person who uses the drugs.
People can take methamphetamine and walk aimlessly in circles, or they can use lysergine and get creative.
It all depends on the drugs taken by the person. Light and heavy are classified. From the lungs there is no addiction or almost no, there is no significant harm to health, and a person does not differ much from someone who does not take drugs. It's another matter that it is hard.