Yes, I would argue that consciousness exists on a scale and that humans, having large neocortical ratios compared to most animals, can use LSD to experience of full potential of human consciousness. By increasing awareness permeate the experience of being for a several hours without psychological disturbance or preoccupation with action. This may have been done through a parasympathetic mechanism, allowing one to rest and digest the senses of the moment without interacting with them. By stepping back from an attitude of constant activity and action-/sensation-seeking, one garners a novel appreciation for awareness of being (of all things entering the senses). So this stepping back is thought to have been the seed for the emersion of self-awareness and its offspring, we call in psychology, theory of mind. Children develop this trait around 4 and it essentially distinguishes hominins from hominids. Armed with these, we have an extra dimensional perspective over other animals programmed into our brains over evolution. That is, we have a propensity for existential thought and this distinguishes us in the animal kingdom and is the trait governing the emergence complex culture. LSD thrusts us into states of pure awareness. Such an experience highlights the fundamental existential nature of humans with deep and diverse emotions, indelibly stamping this primal recognition that we exist.

So then it comes down to the so-called hard problem vs easy problem of consciousness. The easy problem is explained through the mechanistic interactions of matter, which is is answered with the epistemology of neuroscience and the like. The hard problem is said to exist beyond such matters, seeking an ontology of individual experiences (cognitions/qualia/etc.) as existential phenomena. It might ask "why is there such a thing instead of nothing at all?" to which my reply is that such a question is not a true expression of the sensations you are trying to describe. That there is even a satisfying answer to the question of existence versus non-existence is a phenomenological impossibility. I aptly point to the recent developments of the physics community suggesting that there was never nothing. If nothing cannot exist, then the question defaults to the epistemology--what is existence. Experience is nothing more than existence. But it is a type of existence. Do we draw the line of consciousness at experience? Or does it include self-awareness? Self-awareness is a deeper and stronger existence of experience, that is, a subordinate to experience. When we become pure awareness, we also become pure self-aware, and some bold people have long suggested universal awareness. I think this is playing with the dial of awareness, and is constrained by the neocortical capacity of the animal. It's likely LSD acts as a kind of key to the fully conscious potential of human nature.