Is it Sharia-compliant to use hashish or nicotine to prevent coronavirus, based on the rule "necessities permit the prohibited," knowing that they may cause addiction and the harm has not yet occurred?

Scholars differ on the ruling of seeking treatment with unlawful substances. Those who permit it stipulate that it must be the only way to achieve healing and that there is no permissible medicine that can suffice. However, it is not permissible to consume unlawful substances merely for the purpose of preventing a potential illness. Therefore, it is not permissible to consume hashish or any other unlawful substances for prevention.