Purchase pure nicotine from a reputable chemical company. Search the web for suitable solvents in which to dissolve nicotine, i.e., solvents that will not clash with the ingredients in your cell culture medium. Dissolve the nicotine in the solvent of your choice at a suitable concentration. Set up about 8 cell cultures of your choice. Add 0, 5, 10, 20, 30, 40, 50 and 60 ul of the nicotine solution into the 8 cell cultures, respectively then incubate them as usual. Calculate the final concentrations of nicotine in the 8 cell cultures. Observe the cell cultures at various time intervals. Record your observations carefully.