The risk is high if you smoke over 20 a day
How bad is traffic
So, while it is evident that the only way to fully do away with unwanted secondhand smoke exposure is by completely banning smoking in an indoor space, using an air purifier might at least help mitigate the adverse health effects and reduce the unpleasant odor

the charcoal filters comprise 0.2 and 0.3 g of BS 44/52, 0.2 and 0.3 g of BS 52/60, 0.15 and 0.2 g of BS 60/72, 0.1 and 0.15 g of BS 72/85, a mixture of 0.2 g of BS 44/52 and 0.1 g of BS 52/60, a mixture of 0.2 g of BS 44/52 and 0.1 g of BS 60/72, a mixture of 0.1 g of BS 44/52 and 0.1 g of BS 72/85, a mixture of 0.2 g of BS 44/52 and 0.1 g of BS 72/85, a mixture of 0.15 g of BS 44/52 and 0.1 g of BS 72/85, a mixture of 0.1 g of BS 52/60 and 0.1 g of BS 60/72, a mixture of 0.1 g of BS 52/60 and 0.1 g of 72/85, and a mixture of 0.1 g of BS 60/ Table 1 shows that the charcoal filter cigarettes mentioned in this invention are very effective for markedly reducing the content of p-BSQ, the major hazardous oxidant present in the mainstream smoke
But for cars that were smoked in heavily for years, a follow-up ozone session may be recommended a few weeks later