As for the "invisible man" part, I think it can have two meanings. Vanity, like even though no one sees him, he's still obssesed with himself, or surprise, meaning he looked in the mirror and saw he wasn't there, so now he can't look away, because he just doesn't understand why he's dissapeared. I'm not really sure about anything else, it does sound like it's about drugs though.
As for the "invisible man" part, I think it can have two meanings. Vanity, like even though no one sees him, he's still obssesed with himself, or surprise, meaning he looked in the mirror and saw he wasn't there, so now he can't look away, because he just doesn't understand why he's dissapeared. I'm not really sure about anything else, it does sound like it's about drugs though.