fred cigarettes were promoted as being good for health, till early 1950s. : r/HistoricalCapsule Cigarette - Wikipedia

Todays cannabis is substantially more potent than it was two decades ago, providing a more intense and longer high, and more pronounced physical and mental side effects

p=0.246), suggesting that long-term outcomes may be influenced by factors outside the programs scope, such as intrinsic motivation or social environment

And while theres less smoke, theres still enough irritation happening in your airways to mess with your rest

Non-smokers were those who either had never smoked at all or had never been daily smokers and smoked less than 100 cigarettes (or equivalent amount of tobacco) in their lifetime 8

Control 26 (4), 461463