That's why you need 3 different strains on hand at all times(!) ;-)
Each will lessen the effect of tolerance of the others.. heh
I smoked since I was 14, never even questioned it. I like to ride my bike and smoke a dubbie, but it was not very tasty weed back then.
Bike riding + weed is the best thing ever. Been to Amsterdam twice, rode the bike all day every day while stoned