Final answer:
Pam is most likely working long hours.
Step-by-step explanation:
Marijuana is often associated with leisure activities or relaxation, so if Pam were not working at all or working part-time, she might have more time to engage in marijuana use. Engaging in volunteer work requires regular commitment and may not be feasible for someone who uses marijuana every weekend. Therefore, it is most reasonable to assume that Pam works long hours to support her lifestyle.