This study looks at how *cannabis* or *cannabinoids* (substances from the marijuana plant) affect symptoms in adult cancer patients. The focus is on those with **breast, colorectal, melanoma, non-Hodgkin lymphoma, or non-small cell lung cancer**. Participants will have already started or are planning to start treatment with *chemotherapy* (medicine to kill cancer cells) or *immune checkpoint inhibitors (ICIs)*, which help the immune system fight cancer. These ICIs target proteins like *PD-1, PD-L1, or CTLA-4*.
Participants will fill out surveys and have their medical records checked monthly for a year. It's important for participants to understand English or Spanish, have an email, and be open to doing online surveys.
**Key Points**:- Participation is for one year, with surveys every month.
- No new treatments are given, just observation and surveys.
- Participants should not be in another treatment trial or pregnant.
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