Both yes AND no, for a couple of reasons

Yes, they should be allowed to be sued, because if the product's primary use if for that of illegal activities, then the company manufacturing said product, along with the business selling said product for going along with it, should be able to be sued, whilst on the other hand, if the business selling the product is neglecting the fact that said product that they are selling is being used primarily illegal activities, then they should be sued for slightly more than they normal would because they knew the products they were selling were primarily used in illegal ways, they just didn't care about it, with the company manufacturing being sued as normal, whilst if the company DIDN'T know that said products being sold were being used to perform illegal acts, then the store should still get sued, just by a small chunk less, because the company selling the goods in question without the knowledge that they were illegally-used primarily, and the company manufacturing the products in question should be sued with an additional fee of however much money was taken off the fee of the suing retail business selling their unlawfully used products, because the company manufacturing the primarily illegally-used goods, on top of producing goods for primarily illegal use in the first place, which caused them to get sued in the first place, did not notify the retail company that was selling said goods, thus shifting the blame further onto themselves, and away from the company that was selling their primarily unlawfully used goods.