Oxygen! I live in a small town but the air here is rather dirty. And sometimes I go to my father who lives quite far from the city in a private house. Film And there is incredibly clean air. The tower is being blown off of him. Pleasant chill in the limbs, slightly dizzy and a surge of energy.
Not everyone is affected well. My aunt when she comes to him from such clean air is literally very bad, headache and sometimes even vomiting.
So if you live in a place with bad air, get out into the depths of the forest!
Most of all, the drug that I use constantly is suitable for the above. It evokes a semblance of euphoria, and a lot of pleasant visions. Called - a dream.
Of course, this is just my experience. You can try to exhaust yourself with physical exercises, for example, yoga asana will be the most effective in this case. It is worth doing a couple of "twists" and immediately there is a feeling of relaxation, but, of course, at the level of consciousness, it is unlikely that anything will change. The most natural causes of visions, as far as I know, are dreams.) Having made a special cycle of exercises, you can increase / decrease the pressure, so perhaps you will feel a special state, but you need to know the atmospheric pressure and your own in advance. Regarding euphoria, you can try meditation, but nothing will come of it if the goal is to blur your consciousness, because it rather enlightens. Sex can also be the solution. Orgasm, in fact, can be put on with the same euphoria.