is smoking 3-4 cigarettes a day that bad What Does 3 Do to You? - By Dr. Mool Chand Gupta Health effects associated with smoking:

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Health authorities report that tobacco smoke contains thousands of chemicals, including many that are known to cause cancer

Although there is no direct connection between a dental filling and smoking, most dentists will recommend you wait for at least a day or two before resuming your daily activities

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Do your best to have these conversations frequently and, if you can, before they try marijuana for the first time