Happens so that those who practice the mantra yoga try in any ways to enhance effect of practice. And ways which occur the set. What ways are definitely not acceptable in terms of yoga?
The first what it is necessary to tell about, is narcotic substances. All types of drugs lead to failure in practice of mantras.
Why the subject of "nonsense" in general emerges in connection with yoga? Because, for example, the person used something from drugs, at him, in the certain measure, consciousness to some venue or the phenomenon was narrowed. It seems to the person that at this time to him something opens, the world appears at it as uniform vibration, or something in this spirit. But all these "visions" are present only at the time of narcotic action. And what then? And then it will be bad! Then response when to the person happens so not well that he even can't remember what came in dream to it "clarifying" comes.
Therefore if you will ever hear that any given medicine, "grass" or something similar, helps to awaken the mantra, then try to steer clear of it! To you it isn't necessary and argue with public of this sort, everyone chooses the way. And if not your karma to dissuade them, then just go by. Excludes any narcotic "stimulators" of the yogi!
It is possible to hear that even in Ancient yoga-texts there is the mention that practicians used "something", helping on the way of spiritual development. Really, in some texts it is mentioned some stimulators. But why our contemporaries decided that these stimulators of narcotic action? Most likely, it comes from own perversity. And the speech could go also about less strong means. For example, on force equated to the beer bottle. That is about drink of organic origin. And however, even almost not to find such, not concrete mentions in ancient texts!
And all why? Because in yoga all that is excluded, application of what eclipses consciousness. Even something easy, organic origin. And heavier medicines were also invented only in recent years. Yogis just the opposite fight against Illusion, with Maya, with any hallucinations! They try to raise the "island of clear consciousness"! And it isn't even more in jungle of hallucinations to exhaust.