Are you aware of others in your company or at other companies that also use cannabis as much as you? Or are you aware of people using narcotics/amphetamines?
Based on my understanding of the Bay Area, where I've worked, my usage is definitely more frequent and in larger dosages than 99% of employed individuals, but many people consume cannabis on a semi-regular basis. Dunno about the narcotics or amphetamines, it's not something I hear about regularly.