So marijuana is not a significant threat to public health, safety, or personal ambition (No harm in it, Letters, November 10)?

But wait. Cannabis actually contains 50 per cent more cancer-causing carcinogens than tobacco - making it one very mean drug.

Before anyone complains, my source is a recent study by the acclaimed British Lung Foundation.

Surely, then, the crux of the issue is that cannabis is the kiss of death for any society; it's ultra lethal.

Aled Jones, Mount Crescent, Bridlington, East Yorkshire.