I'm only a Wikipedia, cut and paste scientist myself, But it sure seems to me that any simple fluid extraction from tobacco, that resulted in any residual Nicotine presence, would almost have to contain the other alkaloids in their relative percentages, due to their similar composition and weight. But there may be a lot I don't understand about the others.
Nicotine:
Formula C10,H14,N2
Mol. mass 162.12 g/mol
Nornicotine:
Molecular formula C9,H12,N2
Molar mass 148.2 g mol−1
Anabasine:
Formula C10,H14,N2
Mol. mass 162.23 g/mol
Myosmine:
Molecular formula C9,H10,N2
Molar mass 146.19 g mol−1
Anatabine:
Formula C10,H12,N2
Mol. mass 160.22 g/mol