Lyric discussion by Twilight_Eyez 

Cover art for Mosquito lyrics by Ingrid Michaelson

Personally, I think it could be looked at from the perspective of someone being stalked. Lines such as "How can I truly be angry with you? All you want is to be part of me," for example. Stalkers obsess and fixate over their "prey," the person they want nothing more than to be with. It consumes them. Much like Mosquitos, they feed off of the person they're fixated with (well, in a metaphorical sense, anyway).

Also, her reference to poison could be looked at in two ways. First,the stalker poisoning the victim. Victims of stalking become consumed by fear. Constantly worrying that the stalker is close by, when the next phone call will be, what information they found out on them, etc...It's like a poison to them because of the negative feelings associated with it, as well as the frequency.

Or, it could be the victim poisoning the stalker. The stalker could be so overwhelmed with the need to be with or near to this person that it drives them completely mad. Thinking day in and day out, about this one person in particular that they start to doubt their sanity or what they might possibly be capable of doing. Just a burning desire to be in someone's life and want nothing else. That could be the stalker's poison.

Anyway, that's just my 2 cents.