I've never smoked cigarettes, but I've smoked a ton of bud, and smoking anything will mess up your lungs, so these days I usually vape (use a vaporizer)...all kinds of benefits:
? Healthier alternative to smoking
? Stretches your cannabis supply (uses less, more efficient)
? Leftover vape material make good ABV (Already Been Vaped) edibles
As to how much I spend, prolly a bunch...however I don't worry about the cost, since it's about the same that I spent on alcohol before I quit drinking. Besides, I'm hyperactive (and I refuse to take Adderall/Ritalin or other pharma drugs), so cannabis allows me to relax and channel my hyperactivity, which I figure ultimately saves me money, since I am way more productive when I'm not bouncing off the walls.
I really want to get into growing cannabis for my own consumption (it's legal to cultivate in California), but I never have time to do the research to do it right...definitely on my list of things I would eventually like to do though.
ADG