I've had mild health effects from quitting. After going cold turkey, I got depression for 2 or 3 days, and I don't otherwise ever suffer from depression as a norm. After than, I got insomnia pretty badly for about a month. Also, when my body started detoxing, I got acne, and that went on for quite a while. I've never coughed up tar though like other ppl have reported doing. I guess we all detox differently. It just takes hanging in there with patience. If I would have know I would have these side effects from quitting smoking before I began, I would still gladly go through it based on how much more energy I have now and how much better I feel about myself. I'm really thrilled that vaping has worked out so well for me.