Try using a small pile of charcoal briquettes for the main heat source, then add smoke wood occasionally for flavor. Adjust the amount of charcoal used, and replenish the coals with more burning briquettes as needed to maintain temperature.
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Regulating smoking temps by: Keith
I'm sorry about not putting down the type of smoker I have. This one:
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Regulating Smoker Temperature by: SmokerBill
The method of regulating smoker temperature varies depending on the type of smoker you have.
Basically, decrease the heat output of your heat source. Adjust the intake vents on a charcoal smoker. Use ice water in the water pan of water smokers. Last resort, crack open the lid a bit to release excess heat.
Sorry, but I can't give you specific info without knowing what you use to smoke with.