It gives an effective dose of 252 μSv per year, which according to the chart puts it in the green section. Right around the EPA’s yearly release limit from nuclear power plants, but below what you’d get from your bodies own natural potassium or even getting apparently a single mammogram. Not good, but I guess not horrible, though I imagine it adds up over time and the harm from cigarettes may be more chemical than radioactive. Smoking isn’t worth it.