You always hear that today's weed is stronger than in the 1960s and 1970s. Is this true?

Yes, absolutely.

The average THC concentration in today's strains is around 12%, which is about 3-4 times as potent as strains a couple decades ago. Some strains have a THC concentration upwards of 25%.

For most patients, this means 1 to 2 inhalations is adequate for symptom management.