Nicotine's rhymes with:
carotenes, argentines, bernstein's, carotenes, feldstein's, finkelstein's, hammerstein's, libertines, mangosteens, philistines, protein's, proteins, quarantines, seventeens, springsteen's, thirteen's
Nicotine's sounds like:
nastiness, nauseating, necessitating, negating, negotiating, negotiations, nesting, nighttimes, nonacademic