Some cannabis strains are known for being particularly pungent. This is due to low molecular weight thiols and derivatives. Thiols contain sulphur and hydrogen, and this is what causes such a pungent aroma. Typically pungent cannabis strains will have a higher THC level, around 20%, but this is not always the case.
There are indicas, sativas and hybrids that can be described as pungent. For example, Swiss Indica and Angel OG. As such, no matter why you are using cannabis, medically, to relax, to focus, to energise, and so on, you are likely to find a pungent strain that is suitable. On this page you can browse a complete list of pungent cannabis strains to help you find the right one for your needs.