Leonard is stressed and overwhelmed. The best thing he can do in this situation is to take some time out and relax by spending time with his friends to take his mind off things for a little while. The more he stresses and worries about things the more he won't be able to make the best decision for him in terms of where to go to college. He should have a bit of fun with his friends, enjoy himself, have a break and then return to making a decision with a fresh mind.
In a study, the independent variable is the thing that you change to see how the change produces different results. In this study, the independent variable would be the use of nicotine.
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